Use kda for lp gains and losses, challenger stats for backing

So i looked all the last games of the challenger rank 1 player on op.gg (sorry my bad xd), and i have seen that 92% of the time, the team with best average kdas win (12 on 13 games). Total gold is always higher for the winning team. Tho, we can't really use this stat since supports and jungle always have less gold than rest of team. What I suggest is, don't use the op.gg kda cause perfect kdas are a problem with this. But instead, add up kills and asists, then, remove deaths from the score, do this for all players, and then calculate average kda of the team, calculate the percentile above or below the average for each player and tweak lp gains and losses accordingly. like + or - x % more or less.