I don't agree that the fact that you weren't making one argument means that my argument about your actual argument is a straw man."I know that you didn't, nor did I imply that you did."
Then you are making a straw man argument.
It is neat how much you know about the DSS with connection to Daniel 9 and how you really get into it.
It would be also nice if we (the public) had a better, more certain idea of who compiled the DSS. It would also be nice to have more of how the DSS treated Daniel 9, because the Anointed One fragment we've discussed is missing text, and although there is another fragment with verses from Daniel 9, they don't go to the 70 weeks portion.
Alternately, suppose that we did find the missing DSS verses for Daniel 9:25-27. They might easily match the Masoretic text that we currently have but without the punctuation (eg. Atnah in verse 25 between 7 and 62), since the Masoretes were the ones known to have added punctuation. Further, the LXX (Theodotion) seems like a generally good Greek rendering of the Hebrew text. Thus finding the DSS on that missing set of verses might not clear up the issue. Instead, the "Anointed One" fragment that we discussed earlier would be likely more helpful.