I think if you look at the battlegrounds win/loss statistics and compare that to who picked first in their draft, there would be a very evident correlation between picking first and losing. Would it be possible to change BGs so that the person who drafts first picks their defender second, during the first and last rounds?
This Reddit post sums it up nicely:
https://reddit.com/r/ContestOfChampions/comments/y93kd8/unspoken_massive_bg_advantage/