So my theory for the now confirmed YouTube arc are kinda woke but would make sense,

• SMG3 hadn’t planned to steal the remote before the destruction of his studio, as he was already getting popular and surpassing SMG4, after SMG4 destroys the snitch production studio SMG3 decide to get revenge on SMG4. To be able to get revenge he makes a play based on some SMG4 episodes with that he was able to recruit a crew similar to SMG4 but with characters that have the opposite personality or the rivals of the SMG4 crew (e.g Tari and Belle). Once he had obtained that crew he was able to convince Mario to help him get the YouTube remote by mentioning the death of Greg. Now that SMG3 has the remote and can control time and other things it is possible that he tries to get some of the past enemies of SMG4 and his crew to join him to take down glitch production, he will probably convince them with the promise of getting revenge on SMG4, so yes it is possible that characters like Francis make a return in the YouTube arc and that old members of the SMG4 crew also make a return to help SMG4 in his war with SMG3 (e.g Steve and possibly but extremely unlikely Desti) in my opinion the YouTube arc is probably going to be the biggest arc in the history of the SMG4 channel and is likely to have a few darker turns like we’ve seen in the anime arc.

I know my theory is kinda woke but looking at the first few episodes of the arc it would make sense for the storyline to be similar to the one I predicted.