Board Thread:General Discussion/@comment-26261153-20150822013142/@comment-260553-20150826192655

Jefferson and Victor were 'grafted' into the Dark Curse and pulled from their respective lands. This was confirmed both in-series (by Regina) and out-of-series by Lana, Adam, and Eddy.

We don't yet know how/why Will was affected by the Dark Curse and pulled into the Land without Magic, but the most logical explanation at this point based on what we DO know is that he found a way to leave Wonderland and go back to Fairytale Land/Misthaven.