No point pretending he wouldn't be a great high line defender, maybe even a full back for another side.
Becoming a good box defender can be trained into him, as could improving his balance but he's joined a low standard club that hasn't improved him with poor coaching. It would be best for him to join a side with a serious set of coaches, medical department and team mates to become the best player he's capable of - and his ceiling is high.
For us, whilst having a dreadful season, it's easy to focus on his negatives which are easier to overlook if we still win games.
His injury record won't be so bad elsewhere too, so I fully understand why he would want to leave. After 2-3 years at a better club than Spurs for his development the idea of selling him now will seem crazy.