HE has to add couple of pounds
Except he's way bigger, faster and has an absolute rocket on his right shoulder.
I actually think the pounds thing is doable for him by fall. He's 6'2 208. He looked a bit lanky in late season practice vids. For that height he could stand to be 215 (Sims played at 218) but I would think much more than that will affect his mobility. He still has another 6 months to put on 7 pounds. Unless he has BB levels of metabolism I'd say that's realistic.
Also Jalen Hurts is not (currently) faster than Blake Sims was.
Blake's NFL 40 time was 4.57
Barnett's is said to be 4.7
Jalen's is 4.85
Now that'll likely improve with physical maturity.
I still think it'll be BB. He has a lot of the physical tools of Hurt with more height and a longer time in the program. Doesn't matter how quick you can grasp things - there's something to be said for repetition and discovering the nuance of a concept. BB has had a whole year of testing his mettle against the best defense in college football. I like Hurts, I just think that, even if he were to pick up and thoroughly understand our schemes by September, he just won't have enough reps in to make it instinctive. Could be wrong though.