Cut a bandaid down and tape its legs together probly going to need two people to do it it is an art to do it alone I have to have someone hold the chick for me with buttons I can do the others alone
The butterscotch looking one is probley a cinnamon.
I would put a divider in the brooder and let them get to know each other for about a week then watch them close when you put them together. Buttons can be mean little things.
If it is yellow yellow it is white if it is yellow with a gray/brown under tone it is a silver or slate
Sometimes I have chicks hatch like that when I move them to the bator I rub it with a damp cloth to clean it then it fluffs right up