Umm, how do you take advantage of stale quotes with RegNMS; you can't hit a stale bid or offer and then go to another exchange and take the other side of the tr

Umm, how do you take advantage of stale quotes with RegNMS; you can't hit a stale bid or offer and then go to another exchange and take the other side of the trade and pocket the spread. RegNMS forces the worse-priced exchange to redirect their order to the exchange with a best offer. However, best price is determined by the consolidated tape. Are you saying that the consolidated tape could lag and people take advantage of it?