The short answer is yes. He still scores at 5v5. The thing is, I think it's a misconception that we need 5v5 scoring. Kreider, Lafreniere, and Trocheck are very good to great 5v5 scorers. Panarin is a remarkable 5v5 scorer. The main reason this comes up is that Zibanejad is kind of poor at scoring 5v5 goals, but his assist rates are decent.
We need 5v5 play-driving. We don't forcheck, hold onto the puck, or turn possession into offense. In a series matchup, the other team can adjust to what our stars do 5v5 (and on the PP tbh) and we don't give the opponent a different look.
Kane would be more of that. He's not charging after a loose puck and starting a cycle.
He used to be the caliber of 5v5 scorer where you didn't worry about fit. He's not that anymore. He's just good at it.