Dr Ruel is already Canadian. He just turned down a job to the US.

Depends on the province. Ontario is underfunded and has serious issues exacerbated by our conservative former-hash-dealer and long-time Trump supporter Premier who wants to privitize it. Alberta healthcare is a mess from MAGA Danielle Smith trying to privitize too.

From what I know, as with any country, they'd have to get certification by relevant medical association. It's easier coming from certain countries than from others.

For heart surgery it might actually be hard. As the specialties get more specific you need fewer and fewer of them so the spots become more competitive.

Varies by province at it's of provincial jurisdiction and in Quebec there's the language barrier which makes things more complicated