Jacare has more power? judging from what?
Watching them throw punches...
I guess you are one of those people who thinks punching power is some magical natural ability. Whether a punch hurts someone is dependent on physics and placement and nothing more.
I said probably because Weidman might have better placement but Jacare definitely throws faster more forceful punches. They are both grapplers who can get noticeably better at striking from one fight to the next as well.