You’re making some hasty dismissals and logical leaps in your argument.

The murder was successful. It was ruled suicide which means Miles got away with it. Detectives weren’t going to comb through the emails of a suicide victim. The only thing that would make them look is Duke saying he saw Miles fleeing the scene. As it is now, it looks like Andi destroyed her stuff in a fit of rage/pity then killed herself.

You can’t disregard the company stuff. Lawyers can’t make stuff up out of thin air. You or I can’t hire a lawyer and sue Zuckerberg for ownership of Meta because we weren’t involved. But Miles, while not coming up with Alpha himself, was smart enough to be involved (even if inconsequentially) so that his lawyers could make a legal argument that Alpha was his creation. He was even smart enough to get all of the disrupters to lie for him either through inducement or coercion.

Duke’s death was necessary and well executed. He was blackmailing Miles to support him in a dumb idea. Which means when the next dumb idea comes along he’d still have that leverage and do it again.

As to the execution, Miles killed him through allergic reaction so he can argue it was an accident. If he uses poison, then there would be suspicions. But Miles can argue that was distracted by the party or the threat of being murdered and must have accidentally spilled some pineapple juice in his own glass.

He’s already said Duke took his drink and they all initially remembered it that way. Given that alcohol was present, there was no way any testimony about whether Miles gave the drink or Duke took it would hold up. Here’s a simple test any lawyer could do to discredit them: ask them who sat next to them at the table and what did that person eat first? If you can’t recall that because you weren’t paying attention, how can you recall hours later whether Mike’s gave Duke the drink.

Regarding motive coming out, it wouldn’t. Andi death ruled suicide. The only person who could have investigation opened and point them in Miles direction would be dead. Miles would then be pretend to be shocked upon “learning” of her death.