This is the reason I had some trouble with Eisenman. He doubted the dating of the damascus document. Not that this doubt in and of itself was troublesome but alot of his stuff was based on his own supposition regarding the dates of that document.
Yes. I'll have to look and see what date Vermes puts on the Habakkuk Pesher, which was critical to Eisenman's interpretation.
I do think Eisenman's general position on James is correct, even if he has the dates of the Scrolls wrong. An earlier dating would remove the Scrolls as a source of information about James, but there is still plenty there from other sources that are more securely dated.