Miller isn't playing for the same reason Egnew isn't. Neither can block up to snuff. Tannehill audibles ALOT an amazing amount for a rookie and if Philbin is going to him that much of a free hand he knows he can only have personnel on the field that can stay in and block or bump and run. Tanne gets blitzed alot and he cannot have guys on the line or in the backfield who don't have to ability to adjust the protection scheme on the fly
When people say he can't block, they aren't saying he can't handle it physically. They mean exactly what you are saying his shortcoming is. That he will miss some of his blocking assignments. Nobody thinks he can't handle the physical side of it. He missed assignments with the Canes too. He just needs a little more time learning the offense. The Canes brought him along slowly as well.
miller time when he proves he wont get our QB killed SIMPLE