Ah, the legendary "goalies are voodoo" comment.
Goaltender is the most mentally challenging position in all of sports. Reps for a skater aren't the same as reps for a goaltender. Sitting on a bench and time-sharing is not good for a young goalie's development. Buffalo should keep Levi in the AHL unless he's called up with the intent to start him in Buffalo.
The structure and talent of the AHL are irrelevant. Some NHL goalies have started in the ECHL, which is a league which rarely produces an NHL level player outside of goalies. Being able to put the technique together with reading the play, and understanding angles, shooter tendencies, etc. can happen at any level. Levi isn't getting that wearing a baseball cap in a 60/40 time share.
This isn't just my opinion. I asked Mitch Korn about it. That's his opinion too.