The answer is we don't know.
Any team can realistically sign Caleb as he'll be looking at vet minimum money so it's not about cap space of other teams.
It feels like there's some unforseen domino to fall around the league, like a big trade or something, because a lot of really solid NBA role players are still on the open market and there's been no major movement in days now.
To bring back both Caleb and Mo (or Mo and any 15th man really) the Magic likely need to make a trade themselves to, at minimum, get off Jett's money. It's possible there are lots of trade talks going on including us in a move like that (or a more substantial move) but that any move we make is tied to a bigger move in the league somehow.
No insider reports or buzz or anything, just kind of how I'm reading it. (Could be way off base who knows).