If Tyler sold drugs at any kind of volume, he wouldn’t work the night shift at Wendy’s, IMO.
One thing I find very strange which no one has mentioned to my knowledge is that reference has been made to Tyler being in poor health, having chest pains when lifting heavy objects, etc. This is extremely abnormal for a 29 year old. Could he have had an undiagnosed health condition? Could his ill health have been the result of a substance abuse problem? I think it’s possible that Tyler succumbed to a health problem while extremely under the influence and just hasn’t been found yet.
I also think that the wife’s story is believable if Tyler was extremely belligerent when he got out of the Uber, and was combative towards his friend to the point where his friend left him alone. I can see a friend, also very drunk (etc?), saying “go take a walk and pull yourself together”, if Tyler was yelling at or shoving him. After that, Tyler starts to wander in confusion and some sort of misadventure happens and he dies?