Salty's throwing is much improved from about end of May this year forward. So I can't really fault his arm this year. He does not block the plate well. he does not frame the ball that well although with some improvement this year and his target is terrible.
His throws are better I think because throwing is in the main a physical talent and he seems to also have learned not to try to rush the mechanics of the throw to second.
I think it is all the same thing as far as much of the rest goes. He simply loses concentration and focus. He works with his pitchers some of the time by giving them a good target and then out of the blue he will be holding the mitt almost right over the middle of the plate seemingly oblivious to the fact that his pitcher is going to throw it there. I have seen him do that for six, seven pitches in a row. Then either he snaps out of it again himself or somebody yells at him...at don't know but he will work at it again for time before he falls back into holding the mitt over the middle of the plate, 2" or so one way or the other.
I think blocking the plate is a matter of concentration and focus as well. He drifts out into the diamond and away from the plate and suddenly he has to make a play. He is often in the wrong spot still wearing that stupid mask. If he tossed the mask about a mile away at the start of the play he would have a much easier time taking that throw from the outfield.