Tell me you know nothing about basketball, without telling me you know nothing about basketball.
That Raptors team is arguably a top 5 greatest defensive team of all time, no exaggeration. Quite possibly the deepest team in the NBA since Nowitizki/Kidd Mavericks won the title. Kawhi, Lowry, Green, Ibaka, Gasol are all elite defenders. Then you had Siakam, Vanvleet and Powell coming off the bench.
Kawhi was a playoff stud and the best 2 way player in the league of course, but that entire team was elite. Had Kawahi stayed, no doubt in my mind that group wins at least 1 more title.
As for Marner, this year is his last prove it year. The way he's playing though, I expect his game to translate well in the playoffs. Why ? Because he's being physical, forechecking hard and finishing checks, getting into scrums and he's not being a shy perimeter player like he did in years past. It's not how many points, it's how he's getting them. He's been our MVP by FAR this year.
If he doesn't show up in the playoffs again, then yes it's over.