We do though, because they're not going to trade for him otherwise. If Winnipeg isn't willing to give us the Trouba deal then we just don't make the trade. Gorton was literally in this exact situation a few years ago with Trouba and there's no reason to trade for Dubois if it's not at a similar price. The entire concept of trading for him is predicated on him being available for less than market price, and they just won't trade for him if that turns out not to be the case.
This is another caveat that I'm not particularly worried about because they simply won't make the trade without an extension. He'll be an RFA this summer and doesn't actually have a contract for 23-24, so we could sign him long-term right away and wouldn't have to wait until January for an extension. Winnipeg can try to ask for more for this privilege but they don't have much leverage if we're the only team he'll sign long-term with since nobody else would be able to offer more than his value as a rental.
I'm a broken record now but I'm not really worried about this either because the deal just won't happen if the ask is outrageous. The likely outcome is he's going to ask for 8.75 using Larkin + Horvat as his comparables, the Habs will counter with 7.875 using Suzuki as the comparable, and they'll settle in the 8 to 8.25 range. If he's not willing to settle there, the Habs move on, as we're not trading for him without a contract already ironed out. I don't think the idea of his agent using this story to gain leverage with other teams makes much sense either, because the way this is playing out publicly only gives him leverage to get traded away from the Jets, it doesn't help him maximize his contract value with other teams who might be scared off of trading for him in the first place which limits his negotiating options.
If the public rumours were simply "Dubois is interested in playing for the Canadiens" I would understand this argument, but it doesn't serve the interests of Dubois or his agent to sit quietly while Winnipeg beat writers and Friedman/Kypreos report that they have 95% certainty that he is only willing to sign long term with the Habs unless that's actually the truth, because all it does is give the Habs leverage to ask him to take less money, and scares away other trade destinations who are cagey about paying a big price for a guy who won't sign with them. If that reporting turns out to be false, once again we just won't trade for him or participate in a bidding war.