The tweet about fearing an offersheet tells me they are worried if they eat much of their cap space with someone before they get Barrie/MacK signed that they think someone would offer sheet one of them (likely MacK). That kind of seems like bad management if they haven't got a deal inked for both players if that is what is holding them back from signing Radulov. We have roughly $17M in cap space at the moment (if I remember right) with MacK, Barrie, Grigs and Pickard to sign. That probably only leaves about $3-4M after them. They don't really have the space for a big fish anyways with talk of retaining everybody.
It will be interesting to see how they fill out their lineup for this season assuming Iggy is relegated to 3rd/4th line duties and Stuart is on LTIR.