I doubt we think he is though (good enough to be challenging for a CL spot), he is without a doubt a fantastic "prospect" (I love him) but he wasn't good enough to get into Middlesbrough's side, that's why they loaned him out! Admittedly he had a great year and probably far surpassed Middleborough's expectations (helped no doubt by having a brilliant manager at Forrest).
The numbers mentioned are at the very top end for a Championship loaned player, by comparison, Chelsea sold Lamperty for £3m to Brighton only 6 months ago!!!