The dancers are the crew he been dancing with since a loooot of years they’re called BODY&SOUL the other part are another crew. Also he isn’t another person, if you watched his HIT THE STAGE performances and his freestyles or even GOT7 concerts he always been like that, people only noticing it right now but man’s been fire and confident in dancing since debut. It’s just that their old ass company wasn’t taking any profit out of any of their talent, now that they’re already getting better promotion. As a group they signed to WARNER MUSIC so they’re solos but also still a group. Also FYI GOLDEN/GSOUL left H1GHER MUSIC. And as for the collab it’s much likely with AOMG artists that we can expect collab H1GHER artists usually collab amongst themselves and it’s the same for AOMG