I don't understand how it was ever otherwise (assuming you count perfornance with Cavs primarily, and exclude end-of-career Shaq/Wade/etc. Yes, it was a bit silly to ever put LeBron's alleged biological father Nate Thurmond even in the discussion of rafter-worthy, as they talked about on 92.3 this past afternoon, for similar reasons. )I don't think it crazy say Donovan is the second greatest Cavalier ever.
Kanye Kyrie had a case for 3rd best but you almost have to ding him for his erratic post-Cavs on-and-off-court.