DeBoer did say they were going to rotate 8-9 forwards throughout the year. This is part of it if it is only to get Gregor some NHL play to reward him for some solid play.
Bergmann and Yurtaikin have been fine, but enough to not warrant being sent down? Think about how well Ferraro has played to cement a spot.
I mean it makes sense right?
Guys on their first call up are going to be all effort and giving it their all, so just call up a bunch of guys for a handful of games, and you will always have a guy playing with that energy. The Sharks have enough prospects with bottom/middle 6 NHL potential that they can keep this up for a while.
Gregor, Bergmann, Yurtaykin, Chekhovich, Blichfeld, Chmelevski, True, and to a lesser extent, Kellman, Halbgewachs, Weiderer.
Cycling like this gives both optimal performance now, as you get max energy from the rookie, and long term you get a look at the most guys possible.