I'm no QB coach, and not an expert in QB mechanics. I can generally recognize really good or really bad/awkward QB mechanics, but the finer details are not my thing. One still pic isn't enough to diagnose him as completely fucked up mechanics wise. Frazier's only incompletion the other day was a drop by Coats. I heard Stan commenting after the first pass, that Frazier has a habit of not getting his shoulders turned to point at his target, and you can see that in the video below when they move to throwing the ball at the 1:20 mark. You can see Loeffler coaching him on just that, AND when the other 2 take their reps, look how much more shoulder turn they get the first time. Other than that, his throwing motion looks ok to me. I have seen him at times try to "place" the ball, which IME it more a problem with confidence, than mechanics. I think that can be coached out with reps, and gaining confidence. It's simply a matter of muscle memory...reps done the right way. I've seen QBs with worse mechanics be successful. He hit a nice throw on a post route, and that fade-stop to Blake was on the money as well. He may not be completely polished, but what I see so far puts him way ahead of Moseley.
I like what they're trying to do.
Go to the 3:21 mark. Do frame by frame. Get to about 3:24. Watch the motion. He loads up by dropping his lower body and then brings his entire upper body around. His left shoulder falls away and back eventually pointing at the ground. His right foot pivots up off the ground and helps propel his right side forward. By the end of the throw his right side is high, his left has dipped away toward the ground and he's almost stumble stepping forward.
Been a long time since I analyzed QB mechanics from anywhere but my office while I pretended to work, but that's -- at least to me -- classic shot put motion. It's not "cock and release" with wrist and follow through it's more "heave and follow" using a lot of the shoulder.
If he were unleashing a 50-yard bomb I could see maybe having to summon that kind of bring the nuts heave, but he's hitting a guy 10-15 yards laterally. Should be able to do that without flinging his body toward the target. I don't want to see him do a shitty Moseley "angel wing" skip where he opens his entire body up like he's leaping off a cliff and then lobs the ball while falling backward, but that's a lot of oomph for a little throw.
FWIW (clearly nothing) I also thought Pike's fluidity made Clint look like the tinman from Oz. His footwork and comfort in his own skin was 10x better than Clint (in that video).