I think Toronto and Philly are at a similar level now.
The Raps were a cut below the Celtics when they had Derozan and the Celts were missing Kyrie and Hayward.
The Celts will have Kyrie and Hayward back plus another year of development for Brown and Tatum. I think that more than makes up for the upgrade of Kawhi + Green over Derozan and Poeltl.
Besides, who knows what sort of shape Kawhi will be in? He's also made clear -- already -- that he doesn't want to be in Toronto.
Another thing people are discounting entirely is that the Raps went from a Coach of the Year to a head coach with zero head coaching experience. Nick Nurse might be great, but he will take some time to become great, just like Brad Stevens did.
I don't think it's right to say that Toronto has been eliminated from the running, but the Celts sit atop the East a cut above the rest.