getting more chickens change in the flock.

i currently have 5 hybrid chickens which i have had for about a year, 3 of the larger ones are going to join my friends flock and the other two small colubian black tails are going to join a flock of about 10 ,16 week old black rock chickens in about a months time.my questions is if i gave my friend the 3 big chickens now  would the other two be ok or should i wait to move them all at the same time.
the otere problem is the columbians and the black rocks are moving onto a field that i am renting to a new house, should i introduce them to the new place all together or let the 2 older birds get settled first. already in this field i have 6 wellsummer bantams in there own house.

Thanks would the two be alright at home if i rehomed the other 3, and then left them in the garden till the black rocks arrive.

not sure, how long do i need to do that for, didnt even think about that.i was going to apply powder for red mite and stuff before putting them in the house, cant believe i forgot about keeping them apart.

mine fought for a bit but then simmered down. best to get it over with in one go that way you won't get every chicken that fancies it piling onto one or two birds.