My guess - and it's only that - for the delay in signing Tryamkin and Rathbone is that the dust hasn't settled in terms of the cap and compliance buyouts and other mechanisms. Most players will be in a hold pattern until that's resolved.
I get the cap situation holding up signing Tryamkin, but wouldn't we likely just offer Rathbone the max and be done with it? Any amount of negotiation with him wouldn't affect the cap much and I don't see the cap being so low that we don't sign him (if anything he provides a cheap option in case we have to fill spots with ELC capped contracts) and/or he could be sent down and off the cap.