Board Thread:Spoilers!/@comment-30389283-20170123215026/@comment-4453062-20170124022842

Just realized the most plausible reason for his return: Page 23. He wrote it, and it's the title of 614. Fischler may have already filmed the episode, and Adam only just decided to announce it now. Or even if he's not in 614, he could be mentioned and then appear a few episodes later to tie back to it.