I haven't done anything so far. Did not send a webform since I already mentioned it on the other form its not a misrepresentation. I am still conflicted if raising a webform will delay it further. What are you planning to do?
I am thinking about raising the webform with the updated Schedule A. I will just attach a page between questions 6 and 7, raise the webform and ask them to consider this version instead of another one. I don't know if webforms will delay it further. Technically speaking, it shouldn't. Mainly because, there is no conflicting information and the review process should not take longer than couple of minutes; it's literally copy-paste of the SAME information in another Schedule A.
I don't think it matters. There is no misrepresentation, as visa refusals have been declared, at least 2 times (in the original online form in Post-AOR and your/mine spouse Schedule A). Plus, I looked at the library of misrep cases and haven't found a single one where anyone was refused due to not putting dependents in the primary Schedule A.
EDIT: Forgot to add. If they are unhappy, they could send another Schedule A request (there are cases on this forum when they have done it). That can delay the application further. I don't think the webform raised will go through all the levels of the review (case analyst, officer, etc.). It's most likely will land in the "review box" of the current reviewer. Basically, for me (and you) the option is to either delay the decision by a bit, or get a potential request for another Schedule A and delay it by a lot.