So iguadola or Tobias Harris. Great
I think youre right about Jackson - he's pretty much an Iguodala / Gerald Wallace type, except both those guys had superior physical strength - which Jackson does not have right now, nor does he appear to have the frame to support that kind of bulking up.
Tatum is more Paul Pierce / Jabari Parker / Carmelo Anthony then he is Tobias Harris. He has very high potential to be a ROY. He probably has the highest floor of anybody in this draft because (at 19) he's already an incredibly skilled and well rounded scorer and a solid rebounder - those skills alone likely are enough to earn him a significant nba role early on.
In fact Pierce is a really good comparison for Tatum. Like Pierce he does most of his damage in the midrange, but is also very good in the post, is a capable slasher, and is a legit threat from three. like Pierce his game depends more on good footwork and skill rather then being reliant on athleticism, so he's the type of guy who could be a great scorer through to his mid 30s.
Given the minutes I could see him being a 15+ PPG guy as a rookie. I like how he fits our youth too. Brown is the elite athlete and slasher, Smart is the bulldog defender, Rozier is the ball handler and two-way perimeter guy, Zizic is the big angry inside guy, while Tatum would be the go-to scorer who can create shots in ISO situations and shoot from anywhere.
That young bench of Rozier, Smart, Brown, Tatum and Zizic could be stellar...and ba couple of those guys could well take over the reigns once Thomas and Horford start to really slow down.