I am relatively new to the upgrade 'game', so please let me know if I am misinformed.

When you submit for an upgrade as a 1k using cr-1 or SWU, you go on the PA list if NC=0. When you do the same as a 1p, 2p, or 3p, you go on the PB list. Somewhere, sometime, in cyberspace, IM will clear the PA list first, then the PB list second, and these lists are based upon first-on, first off. If a 1k sponsors a 2p with a SWU, that 2p will still go on the PA list, no the PB list because of the 1k sponsor.

After this is done, they then turn the list from IM to DM and go to the e500s and upgrade according to the status.

Is this a correct understanding of the way upgrades priorities work?