Tippett goes no earlier than the #26-31 range in a re-draft, IMO.
I want to start off by saying that I like Tippett, and think he could be a useful NHL player one day if things turn out just right for him.
That said, several things make me think he would fall significantly in a 2017 re-draft.
First, Tippett's AHL numbers (0.73 PPG) this season are less impressive than some other 2017 1st rounders like #21OA Chytil (1.00 PPG) and #17OA Liljegren (0.62 PPG as a defenceman).
Tippett's stats are more in line with lower tier 1st rounders like #19OA Norris (0.67 PPG), who I would also consider a faller.
Second, his OHL production in his draft+2 year actually decreased from his draft+1 season, which is usually a considerable red flag.
Third is the eye test. I saw him last year at the WJC and again this season on AHL.tv. He looks like his shot is coming along well but other aspects of his game (board play, vision, positioning in the D zone) are still lacking.
With a lot of hard work he can carve out a significant role for himself in the future, he has the size and the hand-eye coordination, but as of right now I would say he has fallen considerably.