Wanyamma is one that springs to mind, Larsson another (i think, or was he good before he went up there??) and of cause let's not forget McGinn. Oliver Burke is one who is creating a stir, all be it his game time is at Forrest.
Debelle going to Celtic was/is a great move for him, he wouldn't have had this break though at Spurs, despite Poch's reputation & record for trusting youth. To a lesser extent the loan deal for Ball and Oduwa, who both for the time of there loans got far greater exposure than they would have done if loaned to Peterborough Utd. for example.
Agree he's played a blinder by joining Celtic, stock is only going up and starting CL games and scoring in them is only going to increase his exposure.