You are able to potentially match with any player from any division and team level. Only the heroes you bring into the match will affect the opponents you can be matched with.
You will not recieve bonus points from your opponent’s featured heroes. Only your own featured heroes can provide bonus points on a victory.
the bonus only applies to the winner. you get nothing when you lose. so be sure to use the heroes and win to advance in the tourney. I was able to go from Division 6 to Division 4 after just a single win. In division 1 now. but i tend to use some of the bonus heroes. in case one runs out of lives.