Why would Dr Craig agree to cover anything up and support the defence at trial? He didn't have to say Sheilas appearance suggested to him she took her own life. He could have said he wasn't qualified to comment and take the middle ground. Or side with the prosecution if as you're suggesting he covered up for someone.
Are you related to Mike by any chance?
Dr Craig said that Sheila had only one bullet wound when he made his examination and he said that Sheila's body was on "the far side of the bed". His evidence certainly raises some questions. Mike thinks that the police accidentally shot Sheila when they stage managed the body to make it look like she committed suicide on the floor.
Mike basically thinks that Bamber has two alibis.
1 That Sheila died several hours later than the others while Jeremy was with the police.
2 That Nevill called the police after he called Jeremy.
How would you define your position with respect to an alleged alibi?