The UK Daily Mail (Sunday edition) is reporting that the capt had attended the court hearing of a former deputy PM of Malaysia the same day that he took control of MH370. He apparently has been a staunch and vociferous supporter of the accused (of sodomy in a long standing political battle).
Next, MH370 had made a quick climb to outer space practically (to knock crew out and probably FO sent out of cabin (can captain survive on non-pressurized O2 alone?). Following that, a turn was made with a descent to escape radar. All this at a point of ATC handoever (the black window). Further (?deliberate) turns at Nav points, pings upto 7 hours flying time.
The theory here is that the captain was incensed that his friend was awarded a 5 year jail sentence. It follows that the capt is looking for revenge. He is apparently divorced although wife lives in the same house.
I shall leave it to the imagination as to what the captain's intention is (or probably was), in this scenario.
I have mentioned before a weird feeling about the 'Captain's friend', who opened his conversation in two interviews with the same prepared line about how he knows the pilot. ("because of our common interest in social and politic activism")
He talks way too much about the flight simulator.
He is the only person who has come forward desperate to talk and I will say it now...I think he is going to become a spokesman on behalf of the Captain...we'll see.