From reports from his flying club where he had been known for years he was described as happy jovial and chatty guy dedicated to flying having started in gliding !
The conversation up to the point of the Captain leaving the cockpit was relaxed and normal hardly a nervous reserved personality about to remove himself and 150 others from the Face of the planet
How could anyone be alerted to a personality like that ? Or are things still not as they appear to be ?
There is NO evidence that the door was locked from the inside only that the Captain could not gain access which doesn't mean the same thing
Something is still not adding up right