Mixed flock-which one of these breeds does not belong?

[Mel281]

Golden Laced Wyandotte
Barred Plymouth Rock
Astralorp
Buff Orpington

Would one of each of these breeds be a fine flock?

Is one of these breeds likely to be mean to the others? Specifically I am not sure about the Barred Plymouth Rock. Or are there negatives or quirks I might have missed on these breeds? Thanks!

 

[Basil G]

I think they are all great. I have BR and NHRxBO mixs living together (add in the BSLs and the silkie trio)people have said that BR are bossy, they are, but I haven't had any problems with them injuring others