We already know from CO's previous comments that he believes "upgrades" in a given year are very high. Last year, he mentioned a figure of 10-15k a year for all Countries, while admitting that neither DOS nor USCIS kept any figures.
This year is not a normal year and numbers are likely to be higher than usual due to retrogression last year in EB2.
My worry would be that seeing a high number of approvals with early PDs in early August will merely reinforce CO's opinion about the high number of "upgrades" and that would make him more conservative in the COD movement.
As for TSC, I have not seen any evidence why they would have less "upgrades" as a % of total approvals and I can't think of a good reason why that should be the case either. CO knows they will come on-stream at some point and must bear that in mind.