No he hasn't, you are simply overreacting. He got rid of a guy with a horrible work ethic because when he brings in younger players, he doesn't want Kassian's style rubbing off on a young guy. Anyone he signs is a stop gap anyways, from Vrbata to Bartkowski. Also notice he signed guys to one year deals, if they work their tails off then they are worthy of another contract. If they suck, they come off the books.
Bieksa had a NTC and it was waived because Benning found a deal. Gillis set up whoever was going to be his successor for failure in these situations. Put a NTC on everyone, force the next GM to have to get below market value just to offload the player.
Prust will be a guy who can take care of the rookies for the most part.
I should also mention Sbisa's corsi was worse this year with Bieksa than it was paired with any other partner. What happened to Bieksa? He gets shipped out. Sbisa is not the best player sure, but he is young and who knows what can happen with him. He isn't Kassian and actually gives a shit.