Chickens are good at chicken math too.. hatching 17 chicks out of 15 eggs and having one left over is pretty good...
And yes, he was probably O/o, but you don't know what the White EE has unless you breed her to an o/o rooster and one of the daughters lay a brown egg. If they all lay green, then she is O/O. If approx half lay green she is O/o. However, if none of Rex's daughters lay green - did they at least come out of a green/blue egg? Because if they did somebody shudda gotten a copy from their mom....
Malcom's brother looks like my EE roo - I gave him away when I sold 4 hens. He had no beard/muffs so he lost that somewhere, he had a clean shave. I wasn't sure he carried O either... He did have green legs and a pea comb though.