He's supposed to be working on his mechanics and he needs to for sure. Very awkward positions in his throwing motion...even including how he hold the ball.
You mentioned Ewers short passes. What always impressed me about Tua's short passes is how tightly he could spin it but deliver with such touch that guys rarely dropped a short pass of his. Of course, his slant was his signature throw. Just perfect!
JH will never have those fundamentals. It's too late just like my golf swing will never look like Tigers.
Good news is JM can still play at a high level without great mechanics IF he can learn to do the things he struggled with last year, which are very well documented.
Can he? Million dollar question!