Well either one of us could be correct here, but your comparison has major problems. First those were HOF caliber players which Bailey and Tavon aren't quite ready to be considered for. Further Holt and Bruce would only be smaller recs. by todays standards ,they were not small by the standards of the league they played in,nor did that league have the larger more physical DBs of today so how they would fare in todays NFL is not established at all.I think they would still be good but Tavon and Bailey average as much smaller than Bruce and Holt as Holt and Bruce do our "big recs".
So we aren't talking one step down in size we are talking two,
Despite what Masters and Johnson might say,size matters.