Thank you for typing all that out!!!! I was like they had beef??? But it makes sense. I was listening to Casey on the gypsy tale podcast, he mentioned how he was envious of Marc/Vale who had no fear of the track. Makes sense that Marc - the limit of the bike is when I crash - and him would clash even if it wasn't malicious or personal.

(about this) haha no problem! and yeah for sure I don't think it's anything particularly malicious and it's not even BEEF as much as a low-level grudge, the kind of thing that naturally bubbles up when you have athletes' egos existing within a team structure. though I do think the stuff you mention (ie marc's approach to the sport) is something that never did become much of an issue between the two of them, but only because... well they weren't on-track rivals

ofc that's one of motogp's biggest 'what ifs' - what if we'd actually seen casey and marc compete - so none of this is particularly original, but, look, it's a fun one to discuss! casey's for the most part been pretty schtum about marc's actual races and various controversies, but has on occasion mentioned not necessarily being the biggest fan of marc's approach, eg (from 2013):

the "humiliate them" bit is most interesting to me - does feel a similar vibe to some of his complaints about valentino's propensity for mind games. the implications of marc wanting to humiliate opponents would be that for marc, it's not just about just wanting to win, it's about what effect he's having on rivals, about wanting to mess with them

so I - like everyone else - can only IMAGINE what it would've been like if casey had actually had to live the full marc marquez experience. it's a respectful relationship irl because it's a rivalry that never actually got to play out, so casey doesn't have any real motivation to criticise marc much beyond low stakes honda hijinks. and marc probably would have enjoyed getting the chance to race casey, but from casey's side? eh

obviously casey's issues with valentino's riding standards are pretty well-documented (as well as his issues with other rivals, including a younger jorge) (and various somewhat less significant figures, like him and his buddy in 125cc giving alex de angelis the truly terrible nickname of 'alex dangerous'. casey please). marc is relentlessly aggressive in a way casey would not have enjoyed at all, and would've also objected to on grounds of principle. the fearlessness thing you mention from that very very long podcast episode is interesting to me, because yes casey would have liked to emulate that in some ways... but he does also have his issues with riders who ride without fear to the extent that they don't care about their own safety. from his autobiography, explaining his increasing disillusionment with MotoGP:

The most fitting tribute to [Simoncelli's] memory shouldn't have been a plaque by the side of the track where he lost his life, but a real change in the way riders respect each other and respect the limits. Unfortunately, I don't feel that this happened. I have always been very aware of what can happen in this sport, which is why I have always shown respect to my fellow racers. You might not like the person next to you on the grid but you have to be aware that if an accident happens, anyone can be hurt or killed. Sometimes young riders are so desperate to win that they forget what's most important. They get built up so much that they start to believe the hype, they feel invincible. Nobody is, especially in bike racing. And if a rider doesn't care about his own safety then it stands to reason he doesn't care about anybody else's either. Don't get me wrong, MotoGP is as safe as it has ever been in terms of the gravel traps, circuit layouts and rider equipments, but the fact that certain riders were still putting others at risk even after Marco's death bothered me a lot.

which, yup, can't see casey being a fan of marc. he's got some very ironclad beliefs when it comes to riding standards and the importance of rivals respecting each other and what that looks like on track in terms of hard racing - it's just an outlook and approach that would always have clashed with marc's. (also, yeah, like casey admits, it does just scare him! laguna seca 2008 wasn't fun for him because he was worried about his safety! which is entirely understandable, but I can't imagine if that's the case he'd feel particularly comfortable or indeed safe racing marc marquez.) on marc's side, even in 2013 he was pretty good at shrugging off these kind of critiques from his rivals, including ofc from dani and especially jorge that year. so maybe it'd be mostly one-way antipathy, but probably not all that pleasant for anyone involved. livio suppo said back in 2020 that casey would've suffered a lot from marc's personality, and also in 2023 said this:

I don't really agree with suppo about 2008 and it does lean into the frustrating trope (which casey also chafed against in his autobiography) that seeks to explain all of casey's struggles and defeats by what was going on in his head. like, I do think he would've done a good job fighting marc! he would've won plenty of their duels, even when they were fighting wheel-to-wheel! he did say repeatedly after laguna seca 2008 that if something like that happened again, he wouldn't roll over for valentino (unfortunately we never really had the chance to properly test this but oh well)! he just wouldn't have enjoyed it, which is kinda why he retired in the first place

basically, they respect each other just fine because they never had the chance to fight on track. if they HAD fought on track, things would've inevitably been more fraught, not least because of their very different approaches to racing, as well as how by marc's own admission he's an asshole as a teammate. that difference in approaches is where the 'fearlessness' of marc comes in, and not in a good way for that relationship. who knows how it would have all turned out

just one more thing - marc is actually asked about the "he wants to humiliate them" quote in a presser, but unfortunately the question is formulated in a kinda messy way so marc doesn't really end up directly addressing the comments. though my guess is at least one person present understood exactly what casey was getting at: