So decoy structures are always recommended to be generated and examined, I guess.
But in the case your described, why not just use score_jd2 to score the structures? It seems by default it only generates Rosetta energy scores.
BTW, what is the difference between commands score_jd2 and score? Sorry I could not find doc on the difference between them and they seem to output the same Rosetta energy score values (I know score generates also rms and gdt scores).