The pea comb gene and the blue egg gene are very closely positioned on the chromosome, and are generally inherited together. Thus a pea comb is a good indicator of which birds are carrying the blue egg gene. (of course there are pea-combed breeds with brown eggs too, but in this case we know he came from a blue egg)
You can get blue egg genetics in a straight combed bird, but it's somewhat rare in the US. Easter Egger, Ameraucanas and Araucanas are our primary blue egg layers, and they all have pea combs.
HOWEVER, in Europe, there are birds such as the Cream Legbar, which lay blue eggs and have straight combs. Your guy seems to have some barring in him, so I wouldn't be surprised if there is some Legbar in his past, so he may still have a copy of the blue egg gene in there somewhere. The only way to find out will be to mate him to your birds, and raise their daughters up.
If your only goal is to have a blue or green egg in your egg basket, I'd just look around and buy one. But I've always been one for instant gratification...
