I think Rabinowitz's strategy is to try to establish that Lynch did read - and so know - things he has said earlier he did not know.
(Rabinowitz hopes to prove that Lynch knew Autonomy was fraudulently bulking out its revenues to make itself look like a tempting takeover target.)
Building on that he can then say that he has had a controlling hand and influence over other things
(Rabinowitz hopes to prove that Lynch influenced or controlled the bulking out of revenues at autonomy)
Then he can claim that Lynch committed fraud
... Looks like he is stuck on step 1