If Durant can somehow step in to save the Warriors that might actually cement his legacy.
They don't need him. They should still own the Raptors in this series. Way too much talent on the Warriors.
Iggy is 3 years older now and look like he's hobbling. Livingston doesn't seem explosive anymore. They NEED Durant to compete with Toronto. The Raptors are way too deep for them to handle. Gasol/Siakam/Ibaka is too much for Draymond Green to handle. VanFleet can give them trouble off the bench. Lowry has yet to show up offensively but he will get his spotlight in these Finals.
Yes, the supporting cast makes the difference. Golden State (without Durant and Cousins returning from injury) has two go-to-scorers with Curry and Thompson. Toronto has two as well with Leonard and Siakam, who aren't much lesser. Especially when Siakam is playing like last night. So the advantage there isn't that big for GSW.
Then compare the main supporting cast of both sides:
Toronto:
Lowry, VanVleet, Green, Ibaka, Gasolvs
Golden State:
Livingston, Iguodala, Green, Bell, LooneyDraymond Green and Kyle Lowry are the 3rd options, but the Raptors have the better players overall in this group even though I like Looney's play. There's a clear advantage for Toronto on many levels (defensive, offense, shooting(!), passing, athletism).
That doesn't mean that this series are guaranteed to be in the pocket of the Raptors (we ourselves know enough about overreacting to winning the first (or first two) game). What I dare to say is that the Warriors will need either Durant or Cousins coming back (into form), Curry going into god-mode or they need to find a way to stop Siakam. It won't come by just playing better as a team, since the Raptors are much deeper and have a reliable supporting cast.
Golden State have played some other players spot up minutes, who don't have a big role yet (Cook, McKinnie, Jerebko, Cousins, Bogut) and Toronto has played Powell regularly in previous series, but only played 5 minutes yesterday