I think we did insert a buy back clause or a sell-on clause, but don't let Morty's performances in France lead you to believe that he's somehow good enough to play for us. He's at best a decent squad player. Wharton is further ahead in his development and also 2 years younger.
In hindsight Morton would have been useful, but you know how Slot works, he doesn't do "average".
The kid sat on the bench for an entire year, just look at Harvey.
Also, the French league is shit.