well i'd jux like to say that each ninja has potential to grow stronger.,!!! naruto learns jutsus of his dad, he'd be more stronger.....I hate repeating myself and tbh this whole nb experience is somewhat boring at times. Ive already should you that sasuke has more potential to get stronger than naruto even without gaining the rennigan, whilst naruto ive showed you that even if he combines sm and km, they would just give him an increase in what they already give which is speed/strength/chakra
apart from these two, we can say that kakashi/neji ha potential to get stronger too!!!