Ummm the memo is typed .. why would they need a handwriting analyst ??
Killian's initials and/or signature appear on most of the four memos. The analyst also was called upon to gauge the authenticity by presumably looking at style, stationary, etc.
CBS should have disclosed who gave them the documents and represented them.
I agree with Howlin that there are probably other memos on Bush as well as others but they weren't spinnable as negative (The only one in this group that looks hinky is memo 4 and that isn't about Bush directly so BD).