I try not to beat the dead horse too much, but yes, the amount of strike outs, runners LOB, GIDPs, etc just seems higher since Bolt left (I haven't looked at all of them, Ks have definitely gone higher since, on pace for over 450 this year ).
Jim Rose, I admit a terrible pbp guy but a huge Nebraska baseball homer with no axe to grind against DE, apparently said last year or before that Erstad struggles with teaching. DE's actually recruiting better than some people who want to use our conference as an excuse for his shortcomings may realize. But development is lacking. Guys have to come in already pretty much a stud (ie Schreiber). DE can definitely stay, but he needs a hitting coach
EDIT: just saw your reply to Xmas, so we agree