The West ought to be an arms race. It's more defined with a long list of teams that could go on deep runs. VAN & WPG have already added and could still do a bit more. COL, DAL, LAK, EDM & VGK should also be aggressive and each holds their first rounder. Whereas in the East it's fuzzier with only five teams you'd think are confident about making it in: BOS, FLA, TOR, CAR & NYR. TOR still has work to do but with their headliners they ought to find a way. You'd think NJD with some goaltending will also. But that murky middle may not lead to as much aggressive adding in the East, particularly given that BOS & FLA have already essentially moved their firsts in past deals. Of course, teams can move '25 picks and I don't think it's a terrible idea for a team like the Caps. That does seem like the stronger draft.
Teams can only retain on three contracts at a time so I'm not sure there's a fit for them to be a third-party broker per se (esp. since they may want to keep some cap space free so that they don't have any bonus carryover from Pacioretty). They probably should retain on at least Mantha to up the return/market. Maybe also on Dowd to help secure a first. But they may want to keep a slot open for around the draft to either move Kuznetsov vs. a buyout or to simply keep options open until the new league year starts. I'm not sure a third rounder at the deadline is enough value to burn the third slot. They can weaponize cap space in other ways, like taking on salary dumps if the player is good enough or there are sweeteners. You'd think they'd prefer weaponizing their space primarily to quickly add immediate talent rather than stockpiling futures. The later is what sellers do but they're still trying to compete and some of those futures will get flipped probably (ala Sandin).
Other players that should net firsts are Hanifin, Tanev and Guentzel among rentals and then Chychrun & Laughton if moved otherwise. Perhaps also Markstrom or Gibson if there happens to be a fit among goalie-desperate teams like NJD/TOR. Not sure who has the most dire need of a player like Dowd. Laughton or perhaps Jenner or a fallback option like Henrique does cloud the C market a bit. The very top-end rentals, Tanev/Guentzel/Hanifin probably need to move before teams circle back. Unless perhaps there's a workable package deal where the Caps bundle together Dowd and TVR or something.