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That "modified" pea comb probably means he has a not-pea gene. Other than that, yes you would tell by breeding him. If he breeds the single comb hen, and produces single comb chicks, then you will know he has the not-pea gene.

You will be able to tell some chicks of the Frizzled rooster: --frizzled chicks --barred chicks --single comb chicks, unless your EE rooster also carries the not-pea gene --feather-footed chicks if they come from a clean-legged hen --black chicks if they come from a not-black hen --any females...