1) this might be our guy...
2) Playa Hater, you'll probably like him. He's a pure PF who can play some small ball 5. So fits with what you were saying about wanting a 3/4 or a 4/5. Walker is also a really versatile defender. In the video, Spinella says he can "defend 2-4" yet he shows a clip of him locking down Kennedy Chandler (arguably the fastest, hardest to keep in front of you PG in college basketball) out on the perimeter and there's also clips showing him defend bigs in the post well, and make nice blocks from the weak side so i'm thinking no reason he can't potentially defend 1-5.
Plus he's a pretty good shooter.
6'9" with a 7'0" wingspan so good size. Still only 19 so bigger window for further development, while at the same time being a guy who could potentially come in and get mins off the bench right away.
3) Latest tankathon mock draft has him going with the very next pick AFTER our pick so pretty good chance he'll still be there, but he's a 1st round talent IMO:
https://www.tankathon.com/mock_draft4) the next al horford? maybe. but more realistically, he could be a slightly worse version of horford, which would still be a very solid role player..