You have different expectations for different players and thus different development paths.
Frost and Farabee are more talented than Bunnaman and Twarynski, so why would Fletcher and AV send them down?
Because they'll play more at LHV, and with the early schedule, they'd be Pinatas on the 3rd or 4th line as they adjusted to NHL play.
Now I'll lay odds that both will be in the top nine by January.
Myers is more talented than Hagg, but he's also been very erratic, I'm sure they'll lean on Myers to simplify his game and not try to do too much, because in the NHL he's not going to be top dog, he'll be on the 3rd pair. And paired with Ghost, he's going to have primarily a defensive role to start, so he has to be reliable more than flashy.
You see this all over the NHL, when in doubt, send 'em down to the AHL for some seasoning.