Yeah I think that's probably a good call, but Duran is someone who is hard to ballpark his value. It's only been 2 months, but the current season makes him look like last year was a huge outlier season and Boston may have been better off selling as high as possible this winter.
I see him as somewhat similar to Reynolds in a certain way, even though the skill sets are not the same. Reynolds had the monster 2021 but otherwise amounts to an above average corner OF. Duran looks like he might be about the same, except that he's a better defender who should be able to play CF for a little while longer (he's not for them just because of Raffaela, though his defensive metrics are down a touch).
I think they'd probably want Chandler for him, but Chandler has put himself in a position where he's in that untradable echelon of prospect talent. The team Duran has been linked to explicitly is of course the Padres, and I saw Red Sox fans throwing around Leo De Vries' name (one I saw was even De Vries + Estrada), which is even more delusional.
Keller is also not simple to ballpark value for, but I think there still could be something of a fit. The trouble with him is that he's a regular season stalwart, which is pretty important for securing in-season performance, but I don't know if he's the type of pitcher that you want as the second punch after Crochet in a playoff series. More like a strong #3. He's paid fairly, but it's often a seller's market and it's easier said than done to get his kind of production in free agency. That said, it's possible that his overall profile doesn't play as well in the AL East, maybe somewhat like how things went for Taillon.
I don't know, this is a long-winded way of saying that I agree, but I also look around and I don't see a ton of potential options. The Padres might be interested in Duran, but they are a pretty bad match. The Red Sox don't fully have to rush as I imagine they are ok slow playing Anthony a bit longer, but maybe they still see opportunity in 2025 due to how bunched up most of the AL teams are.
I think it's not totally worth ignoring given the likelihood that we are going to try and shed some salary and obviously there are some connections with Cherington, though not as strong as Toronto at this point. Maybe it would take some additional pieces to make sense (i.e., maybe adding Barco and getting back the volatile boom/bust Jhostnixon Garcia swings it a bit more for Boston's long-term needs), but I'll be curious to see if anything comes of it. I think the pessimistic take on Duran is that he's a solidly above average OF who isn't going to age very well, but he sticks out to me as the right kind of impossible fit in a prospective Keller trade, since moving Keller for prospects is almost surely going to be a disaster (and the whole entire current fiasco really points to the fact that we dropped the ball on moving Reynolds when his value was highest, since now he is not going to get much of anything in a deal).