He played with one of the best assist men in recent memory in Thornton and that is not going to be the case in Toronto. I would love for him to succeed but i don't see it.
He did on the power play. Last season, for the first time in years, he was moved on the top line with Jumbo bc no one else was working there. And he helped jump start that line. So, last season, he did play some with Jumbo (and Pavs) on the top line. But then he was moved (probably bc Hertl got injured).
His role on the Sharks was as a utility guy: he took over for Couture two seasons ago when they made it to the finals. He played center a good deal of that season, including in the playoffs. No one was centering him: he was centering them. (Not Joe, obviously). He gets moved around the line-up wherever they need someone bc he's really, really good at that.
He plays with Joe on the power play but, except for that stretch last season where he was moved to the top line bc they weren't producing (or even playing well) and where he jump-started that line, he does not play with Joe at even strength. He hasn't for years.
The other thing is that ppl who don't watch the Sharks don't know: Joe is not great with left wingers. It's the right wingers who greatly benefit from playing with Joe. On the Sharks, that's Pavelski. (But last season, Thornton was off and Pavs probably benefited more from Burns than Thornton.)