I thought it was probably that, and I admit I get really curious myself!
As to the question about subbing to publishers and agents, here's why I believe the question was made. Let's say you sub to many publishers and get rejected. Then you hook an agent! Yay! Problem is, you've already been rejected by many publishers. This makes it more difficult for your agent, because they can't very well submit to publishers that have already rejected you. Granted you could say, "Well if they rejected me then why would they have accepted me with an agent?" I would reply that often an agent has ties with certain editors, also knows how to sell books, and could quite possibly be able to sell your book where you could not. In fact, that is sort of the reason for getting an agent.
I would recommend, but let's also see what others recommend - I'm just one voice, stopping subbing to publishers for a while and focus on agents. If all you get are rejections from agents, then maybe it is worth your while to go directly to the publisher.