Nash has had some serious concussion issues the past year and a bit.
If he's healthy, I would have no issue with signing him after Christmas at a hometown price. Stay in shape all year. Doesn't have to go through the grind of 82 games. Would be fresh for the final 20 or so games plus playoffs.
He didn't put up numbers with Boston but he had moments in that playoff series where he looked dangerous. If you get him at a pro-rated 1-2 million at the TDL, I see no reason not to plop him beside Kadri on the third line or even with Tavares and Marner.