Hmm, This could really make the research aspect interesting.

Playing world level matches in other games, we used to pour over demos of upcoming teams, just to see how they play. This isn't quite to that level yet, but now you can really look at the numbers of who is doing the most. I think going into an arena against a team, it would be quite useful knowledge who dies the most.

Its not exactly practical for each match, but I'm sure you could research those teams that you are most likely to play when you level in the ratings.