Board Thread:TV Show Discussion/@comment-1031724-20170726043227/@comment-26375291-20170731180008

Manders87 wrote: I think it will work. But my theory is Sam will get kicked out of the Citadel for it since the procedure is banned.

Thinking about it - Sams purpose has to be to learn as much as he can while in the citadel - he hasn't gotten there yet. There is so much more for Sam to learn in order to help Jon fight and defeat the Others - he just can't leave yet.