Ok this changes things a bit. From Darcy talking with Kevin: @11:12 mark
At the end of last season, those players that were on NHL contracts had to sign AHL contracts to play in Rochester. Brennan was one of them.
Once the deal is ratified the NHL contracts are back in force and the AHL contracts are voided.
What this means is that Brennan would have to go through waivers to be sent TO Rochester.