As for Paid J in Zone 1
Think about it, when they call to board, how would that work
"For those of you who actually PAID for your J seat, you may board now"
"For those of you who got upgraded to J, well, you get to wait"
BTW, Boarding DL from ATL-SRQ was even more entertaining. By the time the GAs read the order for boarding and every single category on the list, half the gate has emptied out (to the point of another poster on another thread about the high number of pax on certain flights have some kind of status)