Update on guineas

Still trying to figure out integrating my 8-10 week olds with my main flock. I'm super worried that the big kids are going to beat them up at night, they're just so much smaller. But I really need to move the 6 week olds out of the big brooder and into the dog crate at night/fenced free range during the day. Partially because they're just getting big, and partially because I'm going to need one of the levels in the big brooder for the guineas in a week or so. Do I just throw them in together and hope for the best??