The name Sobiesław Kościuszko sounds like his parents quickly googled "Polish culture" as soon as he was born and then fed him nothing but pierogi his entire childhood
Top left:
“Avada kedavra kurwa”- “avada kedavra bitch!!”
Based on this: https://m.youtube.com/watch?v=P1tE7S1F4-4
youtube
in the center:
“Bejba,” - phonetic spelling of the way our Eurovision singer Blanka sings the word “Babe” (people make fun of that)
Elijah connecting with Gavin again just so he can obliterate him at board games cause he's tired of being beated by the Chloe's it's my humble concept of their sibling bond