The whole team has regressed shooting from deep. I think that's partly the defenses we've been seeing, partly fatigue at the end of games, partly bad luck, partly poorly run offense (a lot of end of clock desperation heaves and early shot clock desperation 3s to get back into games). I don't think it necessarily means the players have forgotten how to shoot the ball, though.
We are missing I think three roles on the team:
1) an elite defender. Last year, we had Moore. His loss on the offensive side of the ball and his rebounding is most glaringly missed, but his ability to make life difficult for whoever he was guarding is really what we are missing. Otis is a mediocre defender (and a little lazy, to be honest). Kier is competent, but I don't think he'll ever get there. Mar is playing out of position, so we don't really know what he'd bring if he was guarding small forwards instead of centers and power forwards. Grayer could be that guy, I think, but that leads me to point number two.
2) An aggressor. No one on this team is willing to take it and shove it down the throats of the opposition. Grayer, again, can be that guy, but he is too willing to sit back. Otis tries to be that guy for us, but he's more suited to being robin to someone's Batman. Grayer has to figure out where his Batman is.
3) The most obvious: a dominant big. Can't do much pressing without a dominant big who can erase mistakes. Can't force teams to back off if you can't dump the ball down low and punish teams for overplaying the perimeter, can't go on runs if you can't secure the rebound after a miss, can't play aggressive perimeter defense if you've got no one in the paint who can alter shots, can't play aggressive perimeter defense if your post player is going to get abused on the inside, etc. etc.