Just because, here's Shirreffs' hudl highlights from 2015:
https://www.youtube.com/watch?v=aDBEwx0UwgM
A couple things stand out to me:
- Has a good, consistent throwing base - could stand a bit taller in the pocket sometimes but looks every inch of 6'5 in the video
- Throwing motion in the video (as has been stated) is a bit slow, though I don't notice any weird extra motions or hitching
- Some beautiful touch on his intermediate/deep passing
19-32, :53, 1:06, 3:17, 3:46, 4:23)
- Throws a "catchable" slant/out/screen
35, :42, 1:19, 2:46, 2:52, 2:59, 3:52, 4:12, 4:19, 4:29, 4:42, 4:53, 4:58) - not terribly zippy, but he can get it there and shows good anticipation and ball placement. Does tend to "wind up" more for these throws than on his touch passes - this could cause these passes to be dangerously late sometimes
- Throws a very nice fade - something I rarely see HS QBs excel at (1:01, 1:15, 2:04)
- I like the way he looked off the defense at 1:19 and 3:05 before throwing the tunnel screen, another good look-off at (2:15), and again at 5:05
- Good mechanics and footwork on rollouts - keeps his shoulders square (1:27, 3:31)
- Good pump-fake, but like his release it's slow (1:40, 2:23, 3:58)
- Shows some escapability - doesn't seem like he's going to be a big threat with foot speed, but he can get those 5-7 free yards when things break down, and still looks downfield to extend plays (1:48, 2:37, 3:23)
- Nice convincing playfakes (4:49)
Overall, if he can tighten up his release on short throws (if he hasn't already) he's got some nice mechanics and really good ball placement. Not a burner but seems to be someone you can rely on to shift the pocket and extend plays when necessary. I'd love to hear from somebody who has seen him throw at UM sometime in the last two years to chime in, since I'm working with HS video.