I just went through the list of the best small forwards. I see elements of Dr J, Grant Hill, obv Truth, and Rudy Gay (an offensively gifted player).
At 20, Tatum might already be good enough that he's not compared to other players, but other players should be compared to him. He's an absolute home run by Danny, as was Jaylen Brown, and Terry Rozier.
It's hard not to get excited about his future.