toly, I can't get to post 180 from the link you posted. Also, any and all wrist extension (there should be minimal to no flexation because of pronation) should be occurring naturally from the SSC, there should be no intentional "flicking" (ties in with lack of flexation). When in the PTD position, the opening of the racquet face is necessary, so I wouldn't say that's a poison motion. And I don't think the wrist should be locked from the beginning of the forward swing on to contact, it naturally extends from the "whip" of the SSC. That's what I've gathered from reading about the SSC on the boards and from instruction on my forehand, also from the boards haha.
Btw, I have found the pictures I want to edit on and post so I will have those done tonight.
"Why should the devil have all the good music?" Kevin Max, formerly of DC Talk