So you “watch” PA 3 to 6 hours a day, And you can’t tell the difference ? You may be wasting your time.
If they normally trade a 2K lot for a certain risk profile they will reduce their size to adjust to current volatility. Even large traders want to control their potential risk or reward ... If ES normally moves 5-10 points in a day and now moves 100 points in a day, they will reduce their size. I never said anything about targets, i am talking about risk. You might disagree, facts are facts.
Even retail broker like IB has an "hidden" option to hide bid/ask, so I would assume that the bid/ask size won't matter that much.