I think his whole feng shui is off, tbh.
I don't know that any rational person thinks Sid's game just fell off a cliff and he's some random schlub (outside of the obviously disturbed posters), but not having that sorta familiarity to his line/shifts in Jake is f***ing with Sid's head more so than anything else, imo.
It doesn't really matter who plays with Sid. If he's not comfortable with them, his line's not gonna play well or produce. It's been that way forever. Sid's linemates have to be the right linemates as opposed to the best available. Dude doesn't adapt or adjust his game for anybody, so they're either a perfect fit instantly or it's just gonna be a disjointed pairing until it's broken up.