Not a response to just this post, simply not going to scour the whole thread for other comments...
I don't know why people are blaming this on being a "running quarterback". The injury happened on a set run play but it wasn't an unusual tackle, like a head-on collision at full speed that you might blame on turning your QB into an RB.
This tackle could've happened on a scramble or in the pocket.
The problem is Richardson fell awkwardly, for some reason extending his elbow toward the ground instead of tucking. Maybe he was protecting his head since he had a concussion recently. That's also not unusual for anyone in the NFL.
So his upper arm would've pistoned into his AC joint and probably tore his rotator cuff.
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He was looking really good as a QB before this. Shame his season ended this way. Shoulder injuries can take a long time to heal and he may not have the same arm strength or mobility later. Depends on how good the doctors and rehab are.
If his season ended because of a called run when he was still protecting a recent concussion, then some coaches have some splainin to do.