Well, it is only for champion 1, but it is assumed that champion 1 top 10 and overall top 10 would be same.
However, since it is based on only 7 wars, it doesn't represent the actual figures. Say if the actual top 8 are all matched in same group, they all fight each other and ended up 3-4 wins each. None of them would find place in current ranking. So it is up to you on how seriously u take this ranking. And of course, there are no separate rewards for them, so it's fine.

