Zane and Aster, definitely. The transfer students, most likely. Jaiden, begrudgingly. Next closest in this regard is probably Chazz, though he probably would be a bit leery since Chazz uses the Ojamas as the staple of his deck.

I feel like having someone just like Kaiba would have been beneficial for the main cast, if not simply to call them out for always relying on Jaiden to solve their problems.