Sorry, but just not gonna happen. TOR is going to resign Dion. That's kinda obvious.
Why did Chara sign with BOS? Remember, he was on OTT a perennial playoff team and went to a loser of a franchise at the time - yes, BOS was just above the CHI trainwreck. He went there because they PAID big $ to woo him into playing for a BAD team. Team management intended to build around him AND invest in the team $-wise (the B's, much like CHI were cheaper than their original six buddies).
Gee, they invested in the RIGHT guy, then the TEAM, and now look at BOS and CHI - on top of the world on any annual basis. They cleaned out the management teams and brought in smart people with a winning track record. The Isles? Ahhh, not so much.