As for play skill I think that's a reach, after watching people sac lotus and concede, and all kinds of awful play on streams of the dailies I'll reserve judgement. I'm sure the P9C brings out a more experienced class of player.
Black Lotus is currently bugged...you used to (and should) be able to undo the sacrifice, given the lag and memory leak issues the client has. I was knocked out of contention in the Power 9 tournament because of the this. I don't think a misclick is really evidence for or against player skill though.
Thanks for doing this analysis it is really helpful. I am a little scared about what this graph starts to look like now that shops took its big hit, but only by looking at the facts can we really understand the meta.