I'm torn on this in general. There are a few red flags with this situation that give me pause: Two teams have basically given him away, and his market appears very thin so far in free agency. He's also a slower, contested catch type of receiver which the Patriots typically don't feature well, and he's got reports of not being a good practice player. When you're trying to re-establish the fine details in your system, having your best WR not all in isn't ideal IMO.
That said, he is still REALLY good and would instantly become their best receiver. So if they think it's worth it, no doubt he's a boost to the offense. I just wonder if they'd be better served using this year to learn about Mac Jones, find out if he's the guy with a collection of good (but not great) weapons and then, if he passes that test, go all in on a big shiny toy next year when they've got a ton of cap space and a year of polish under O'Brien.