Whenever I remember the Saiyan pods they travel in
All I can picture is behemoths men like Nappa and Raditz being forced into fetal position in stasis due to not having enough room while Vegeta in there like:
"He's gonna make me go bald before he even starts walking, your highness-"
I believe Nappa really was a bodyguard for Vegeta, especially when he was a kid. Of course Vegeta has a higher power level, but wars and battles aren't always about power level. Nappa has more experience, more knowledge of survival, more understanding of battlefields. There must have been plenty of times where Nappa actually saved his prince's life.