Suzier, I get where you are coming from. One could easily make an argument that MP was laying the groundwork for Gail appearing to be mentally ill to perhaps explain an apparent suicide. Sounds diabolical, but this type of premeditation is supported by his statements prior to and after her disappearance. I have yet to see an explanation of why he did not attend the work conference that weekend, what car was purchased by he and his GF, and why he returned early. Circumstantial I know, but incredibly hinky...
This is all 100% personal speculation, not based on fact, all just my 2 cents in a devalued market:
Personally, I think he was trying to push the mental illness thing for the inevitable divorce and custody battle. And I think he was so engrossed in that, in trying to "win" the divorce and make Gail out to be the baddie that he immediately felt like a victim when Gail went missing. He felt like Gail was doing this to him, taking things out of his control, and he became angry at her. So he refused to search for her. He immediately filed paperwork against her in court, told the media and the courts she was paranoid, she'd taken tens of thousands of dollars of his stuff before she left, she was probably going to kidnap the kids and go to another country, etc. His friends posted online that Gail had taken $420,000 out of accounts and ran to another country. MP hired lawyers to plant the stories about Gail being mentally ill, about her brother killing himself (implying family history of suicide and/or reasons for despondency), all because he was angry at what he felt Gail had done to him.
It was all incredibly overdramatic stuff, really. Even skipping out on work to go buy a car with the co-worker he was sleeping with, then ending up at the police station when he returned home early, is overdramatic. Coupled with all the crazy coincidences that went on and the people who wanted to ride the wave of attention for their own personal gain, it's no wonder Gail's disappearance caught the eye of the public and the media.
Maybe it was never a crime. Maybe we're at this point right now because of a highly charged personal situation where multiple attention-starved drama queens inadvertently made an accident look like a soap opera plotline.
As for MP being "innocent," I could never personally consider him innocent. Not guilty of any criminal wrongdoing, sure. Not innocent.
Again, all of this is completely my opinion.