My FC is planning on having 2 raid groups, and some people from group 1 want to help group 2 also.

Can somebody who raids savage mode with group 1 also do it in group 2? Even if they can't get loot, just to do it and help? I've heard that with old raids it would lower the amount of loot your group gets, but i've also heard you get locked out and can't go back in.