You'd have to be desperately looking for them to see that

*thorws knife and it hits a wall* oops

NOOOO GRANDPA MAX IS AKAINU!

So is One Piece in Ben 10, or is Ben 10 in One Piece?

I think Grandpa Max is Akainu in One Piece

Bro got younger.

Its the damn fruit

Kids don't wanna eat their greens, Grandpa Max showed them real quick.

Yep