He has a pea comb, it only looks funny due to being not pure for pea comb. This is very normal.
IF, and this is big IF.. the EE roo either was pure for both pea and O gene, OR if he was not pure for pea BUT his pea comb gene is linked with O gene then yes this roo will be excellent for breeding with blue/green eggers being the goal.
However the EE part is the problem.. they're a very mixed bag. There are a lot of pea combed EE that don't have the O gene. So for now, he is kind of a gamble.. you can try breeding him and raisning the daughters and see if all of the pea combed ones lay blue/green eggs, then this is proof there is a pea comb and O linkage in this line and you can use any of them for that sort of project.
Alternatively if you have sisters to this roo, check their egg colors, especially if the sisters are also out of BO or any single combed hen.