Seth Jones is Seth Jones. You don’t think the going rate has already been established around the league? And his situation is pretty obvious around the league to anyone who’s paying attention. PLD quit on his team and still brought in a decent haul. Seth Jones isn’t suddenly going to go for a third round pick because other GMs find out (as if they don’t know already) that we’d prefer to trade him by September. In fact I think the only way the offers dry up is if you wait too long and teams will just go the “I’ll just sign him as a UFA” route.
There is no harm if our external message is "we're trying to sign him." It sends a message that you better blow us away with an offer. And maybe some team would. Obviously he's getting at least a first round pick and a top prospect, but beyond that might be determined by just how much we can convince a team that we're continuing negotiations with him, so if you want him, pay up, because we're working to keep him otherwise. Maybe that's a bluff, maybe it's not. But there's absolutely no benefit to coming out and publicly saying we're definitely trading Jones before training camp. Perhaps there's no harm, perhaps there is harm. But there's definitely no benefit.
As for the actual timeline decision:
Bringing up PLD is a bit ironic, because if we had held onto him and not rushed the trade, maybe we could have used him as part of a trade for Eichel, as an example. At the start of the season, Eichel wasn't on the block. If we had waited approx. one more month, that could have been an enticing part of a package (with an add in addition to PLD) for Eichel. Buffalo would be more likely to trade Eichel to us if they knew they had another young 1C coming back to replace him. What assets do we have now for a trade like that? That's just one example of rushing a trade perhaps not being in best interest.
The NYI would have had a MASSIVE haul for Tavares if they traded him at the deadline. We would have had a massive haul for Panarin if we traded him at the deadline. It's just that neither us nor NYI actually pulled the trigger. Arguably a bigger haul than summer because teams get desperate at the deadline. They think they're "one piece away" from winning the Cup. There's not that desperation in August. In August, teams think they have the perfect fit. Then they get into the season and realize "actually, we really need improving here" or their star defenseman gets injured and needs replaced. There aren't many big trades at the deadline because normally the biggest names have already re-signed with the current team they're on and/or they're on playoff teams, so not being dealt. I don't think it has anything to do with teams offering less than summer, but more to do with those types of players are just rarely available at the deadline.
On the flipside, if a team wants to try to re-sign Jones, maybe they think they need to trade for him in the summer, so that's when their best offer is. Or maybe a team that actually ends up having a really bad season mistakenly thinks in the summer that they're a contender so have a great offer in August but then they're no longer a trade option at the deadline. Or maybe Jones gets injured and we're screwed. For those reasons, it's possible the summer is better. But I really don't think there's this definitive: "he must go in summer" or a need to panic/rush a trade. And even if that is the case, we don't need to say it.