I predict we are going to see a new type of flagging when this happens. We are going to see these returnees downvoted by some of the disgruntled Steem loyalists when they get the big upvotes. This is going to be a bit of a thing on here. You wait and see.
Hopefully if they do return they provide good content. If they are just going to post memes and cute cat photos, then hopefully they don't. Anyway, I don't know about the flagging, but plan to stay clear of the blast area if at all possible.