Board Thread:Character Discussion/@comment-76.209.53.236-20130629182442/@comment-5281989-20130708050601

Tom Ellis isn't available-- they wanted him back, but he's got his own thing going on (I don't know what, but they have announced he's been recast)

Fortunately, no matter what Sebastian Stan's got going on, the creators have promised to never replace/recast him. Yay!