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.