Seems like bully ball brings us back to the early dynastic period where ball control and a bend-don't-break D were the norm. The phrase 'X has forgotten more about Y than Z will ever know' gets overused, but BB really is on another level by bringing his understanding of football philosophy to player acquisition as well.His top-end speed isn't that bad - he ran a 4.53, same as Mike Evans and in the same ballpark as top receivers JuJu Smith-Schuster (4.54), Davante Adams (4.56), Nuke Hopkins (4.57), and Michael Thomas (4.57). He falls in the category of most NFL receivers, where he isn't going to win with his speed, but his speed can't be ignored.
I don't think it makes much sense to move him to tight end, as you seem to be suggesting, but I think you hit on something about his physical profile. Gronk was a tight end with tight end athleticism who was almost built like an offensive tackle; he was a physical mismatch for linebackers, much less the defensive backs who often covered him. In a similar way, Harry, is a wide receiver with wide receiver athleticism who is built almost like a small tight end. He's a physical mismatch for the cornerbacks who are going to be covering him, especially if they use him in the slot and he gets matched up on smaller slot CB. He's not going to outrace those guys, but he is so much bigger and more physical than the players who will be defending him, he will still be a handful.
On N'Keal, just reading these descriptions kinda reminds me of Devin Funchess (full disclosure: I watched him closely as Michigan and loved his game from day 1).
Funchess:
6'4''
232 lbs.
Arm length = 33.5''
40 = 4.7 secs
Bench = 17 reps
Vert = 38.5''
Broad = 122''
N'Keal:
6'2''
228 lbs.
Arms = 33''
40 = 4.53 secs
Bench = 27 (!)
Vert = 38.5''
Broad = 122''
FWIW, NFL.com lists his comparable as Allen Robinson. I'd take him or Funchess in a heartbeat.