quick, semi-related question:

I have my main account with a few level 70s. I also have 3 other accounts with level 3 crusader on each.
Now I want to use my level 70 crusader to boost the 3 lowbies, but I want to do it on torment 6. Can I use a level 1 on my main account to create a T6 game, invite the lowbies, then switch the level 1 to a level 70 and have a level 1 t6 game to boost in?
Also, can I play adventure mode? (rifts for shards) or does each of them need to first kill act V boss?


Edit: at work so can't test it myself