I was having this conversation and might as well ask here. Would Ohtani be the biggest "star" Toronto has ever had? Matthews is one of the most talented players but NHL players don't have the same star power around the world.
I would argue Vince Carter was probably the biggest one we have ever had, but where would Ohtani rank?
Are we talking about pure "worldwide star power"? If so, I'd say he'd be hands down the biggest star the city has ever had. Capturing the Japanese market would trump anything we've ever seen here before. Things were insane here when the Kawasaki craze was going on. Can only imagine what it'd be with one of the sport's all-time great talents.
Carter is a good choice. Matthews, when we look back in 20 years time, will likely be in the conversation; but as you say, only a handful of hockey players have ever made a dent on a grand scale. The other name I'd throw out there is Kawhi Leonard, even with him being a one-and-done in Toronto.