Sorry for your loss. I love your rooster's name. When moving chickens from one coop to another they need to be confined in that coop and run for at least a week to re-program them to where home it. Depending on the coop you can fence off the back half with plastic netting or temporary fencing. It is very boring, but I have found it works. Then cut a hole in the fence or take it down, then watch for any severe bullying while they work out the new pecking order. They will probably hang out as a gang, running away from the older ones for awhile--this is normal.