This is why I don't make the trade for Grant now, even if I like Grant (which I don't particularly... at least at his cost). Play out free agency (or at least tamper away until the eve of free agency so you know where you are at) and then the team and Dame can make a decision in conjunction knowing what options are on the table. Grant will still be available around the draft or this summer if that's the direction you want. If you think you can legitimately retool and make a run (signing a big name in free agency, trading someone into cap space), go for it with Dame's buy in. If you are hearing that free agents are not interested, etc., the team and Dame can amicably part ways this summer. In the latter scenario, which I think might be a legitimate option, I don't want Grant (or someone of his ilk) on the books, and I don't want to lose a single first round pick.
I hope Cronin is patient here, and unless it's an absolute slam dunk, wait until at least the draft to push the chips all in on rebuilding around Dame. There is NO reason to do it in the next 48 hours.