The problem with Werner isn't that he didn't adapt, his problem is that he can play as a striker in some teams (mostly counterattacking ones) but can't in a team that is trying to create chances through possession as well. Most of what he played for Chelsea was as a winger/left sided option, Lukaku (or another striker) will be brought not to replace Werner but to play as that focal point alongside him.
They really do need a striker, a good one would bring them a level higher and they are smart to use their CL win to get the best one they currently can.
IMO, I totally think Coaches are meant to bring the best out of players, yeah indeed leagues Varies according to style of play and other things.
Frank Lampard fail to do so to Timo Werner , reminiscing how good this player was some seasons back at Rb Liepzig.
Getting a good sticker you said ?? Best believe Timo is a good one, imagine him playing for Bayern Munich......I think Thomas Tuchel should help work him up.