I can see this. There could have been emotional drama for sure, which is not unusual. It may not have happened exactly that way, but you make the story sound believable. The only thing is that his car was seen leaving the driveway before she arrived home a few minutes later.
If she (or someone) had left her car somewhere else (train station?) - making it look like she wasn't home when he arrived, thereby also catching him off guard - she (or someone) could have driven his car there to leave it and pick her car up and drive right back home...
Thus explaining his car coming/going quickly and her car being seeing quickly afterwards.
And if she was only gone a few minutes, having taken his car and not leaving one there, maybe figuring then they would HAVE to talk about things (or whatever) b/c he
couldn't leave (his car wasn't there and he wouldn't know where she put it, and until she got back to the house her car obviously wouldn't have been there either) that really could explain her quick concern over him being missing.
If she thought she could catch him off guard and have him stranded, only to turn around and find him not there a few minutes later, I could see someone getting very panicked quickly.
Especially once it was obvious he didn't just walk around the block to cool off.
And then that could explain LE thinking it isn't foul play - b/c she assumes he left in a huff and would be back sooner or later, after all, how far could he go on foot - but yet her filing the police report quickly. (Heck, even that could have been a 'how dare you' - if he were to have left in a huff)
Do we know the timeline of when the bike was realized to be gone vs. when she found the phone and $ in the garage. Could the latter two have led to realizing the former was missing? Or the former being found missing made the latter two get found?
That definitely was an 'out of the box' theory that I could see explaining most of the little we know and filling in some of the many gaps.
Other than, of course, where he'd have gone to.
