IMO, Rangers 'crown jewel' has to be Ryan Kent, I'd be shocked if the club didn't have to fend off multiple big money bids for his services over the summer.
Morelos has likely played his last season at Ibrox.
If Barisic has a good UEFA Europe this summer, then he too, could well be for the off.
It's also not unreasonable to presume that Helander, Hagi, and Kamara might be the subject of transfer bids.
The upshot of this could find Rangers awash in transfer cash, but then needing to replace half of the current first team squad - in addition, of course, to any new signings that were originally being contemplated.