Wouldn't an offer sheet be just the same as a team negotiating with a UFA?
ie - this off season Panarin probably got contacted by 10+ teams all of whom offered contracts (most probably didn't put it in writing, but just verbally said "we'd do 7x10M$").
I expect the same thing happens with RFAs. I expect Habs contacted Point and said something like "7x10M are you interrested?" and he said "no, but thank you". And they didn't go higher. And these types of conversations probably happened with many other teams with high profile RFAs. At some point an RFA will say "hrmm yeah i'll take that" - kind of like Aho did - and that's when an offer sheet actually materializes.