My post wasn’t meant to prove your point being wrong, but more to amend it being purely player related, but more a balanced with org and other players. It’s not a pure individual drop off, even though he didn’t look much better at FNC after that (probably a bit for the same reason).
The coach of TSM of that time even defended YellowStar on the famous DL clip and said that he was totally lost and burnt out quickly because he arrived in a team that had an abysmal level of communication, which he was not used to. Literally nobody talked besides him, so he tried to do the extra part and do it all by himself, which even worsen his mechanics which have never been his strong point anyway. He was desperately willing to put a lot of effort in guiding a team that didn’t want to be guided.
TSM 2016/2017 was kinda like FNC 2018/2020, a team that had strong individuals but failed to really be a team, despite their success.
and it’s even worse with the poke/deep AP version of him.