openaccount,
I am happy to admit that my knowledge of the interfiling and requesting the EB2 petition to be the basis for approval of an existing I-485 is very limited. I don't pretend to understand process fully.
For instance, can the EB2 petition be made the basis for the I-485 at a time when the EB2 PD is not Current? Do such cases have to wait until the PD is Current again?
I seem to remember reading a post by Ron Gotcher about this, but I can't remember what he said and for the life of me, I can't find it again. Grrrr.
Maybe Kanmani can come to the rescue - she has the knack of finding these things.
At the very least, there are still the numbers between May 5 and October 1 that we know nothing about. If they can be switched from EB3 to EB2 in the Inventory when not Current, we should see at least some of them in the next Inventory. If not, they will appear as dates become Current.