DD,
Another informative post. REgarding
"Question: Is extrinsic evidences like expert's declaration having little value in the Markman hearing or and further execution of the case?"

I think the answer is that its useful but may not play a big role. Here's a link that appears to support it
http://www.ims-expertservices.com/bulletin/august/bulletin-082205.htm

Regarding Gafford, the impression that I got when reading his testimony is that, he was not defending prior art but instead trying to claim that the 336 patent isn't even used in ARM's chips.