I will say until prove me wrong, that I don’t think he is back and I say that since there are several ouat members that are advocate of bullies keep out, and 2 of them are making a Psa together, that they invited mrj to be part of it, in fact mrj even started following one of them recently bc he already followed the other, so yeah, he may be in van simply go be part of a Psa against bullying and meet with Colin and Sean, probably the other pic was the 1st meeting and now was the goodbye one.
Also that fan tweet has a logic, that person is tweeting spoilers , the previous posts about ouat were , that Emma goes to hell to bring hook on the winter finale, that on s5b underworld will be seen, and obvious based on fans speculations that Neal would be back, which is sort of true, I mean a young Neal did filmed with rumple and Milah, even tho h was Bae back then,but Neal 1.0 or Bae are the same person.
"I offended you with my opinion? Ha, you should hear the ones I keep to myself".