Here's my 'Breeze', that I was Guaranteed was a hen, along with her(/his?) sister, 'Shy'(the slightly smaller one). Both are Prairie Bluebell Eggers. I'm pretty sure now that 'Breeze' is a roo, between his pronounced comb & his tail feathers being longer than everyone else's (they're also more vertical, if that makes sense). He was All blue/greys until about a month ago. Now he's got the same russet colors yours has.
Was/is yours, in fact, a rooster?
I've got Black Copper Marans hens that I'm curious about breeding with this Bluebell (if it is, indeed, a roo). I've read that BCM roos bred with PBE hens can produce green eggs, possibly Dark green ones. I'm wondering if the reverse (PBE roo & a CBM hen) would be true?