Anthony Davis is absolutely as impactful as Kawhi. He's a big and not a wing so it looks different, but he is right there. Davis on this years Raptors instead of Kawhi would be on the most talented roster he's even been on by a large margin.
There is a big difference between how good you are (impactful) and whether you can sustain the emotional discipline and pressure of 4 playoff series and beat a number of other players roughly as good as you are.
Davis probably has the most complete talent in the NBA now that LeBron is starting to slow down.
There are a number of guys that can go off for a few playoff games. Kyrie showed he was able to do that in some huge moments for Cleveland. Our own Jaylen Brown has been the best player on the floor for several playoff games already. That isn't what we're talking about.
The only ones in the NBA who have shown sustained greatness under pressure over a whole postseason is LeBron, Curry, Durant and Leonard. That's the whole list. Going forward, I'd bet on Giannis too because he's so intensely competitive, but everybody else is a maybe.
Being an MVP means nothing if you don't also have that capacity to handle sustained playoff pressure. Who cares about Harden or Westbrook. They will never win you a title like Kawhi or Durant can.
Put Davis down as a possible playoff hero, but until we see it, we don't know.