Introducing hens to pullets

So my husband rescued these 4 chickens (have no clue what breed they are or how old they are) our OG girls are 7 weeks and 9/10 weeks. he wants to introduce them on thursday, which will be 7 days of them being side by side in different runs, and sleeping in a dog kennel in the coop… i know pecking order will take place, do yall think my og girls will be okay?