After reading all of the posts, it is a tricky situation.
I can feel for Muppet when your "baby" goes down and is a loss. But it's also tough to put all the blame on DJI and mistrusting them when it's a "he said, she said" type of situation.
DJI can't go around giving out new drones everytime someone has a crash and says it wasn't there fault. There evidence says that nothing was wrong on their end and that the bird didn't malfunction.
Since the bird is gone, there isn't any way to a postmortem on the ground for any indications. Also, there hasn't been an upload for any of us to peruse and see if we can find anything.
Right now, the only answer that has real backup to it is DJI saying that the data shows nothing went wrong.
I feel for you Muppet, but I feel that the mistrust is not fully warranted without any real backup. You say nothing went wrong, and point to videos, but have no real backup on it.
I know you said that the battery was in, but I've seen videos of guys with the batteries "click" in, but only one side fully clicked in. Needless to say, this would end with a situation similar to yours.
You would think that if one motor went out, it would show in the data and you would have a claim. But again, no data for us to even look at, so we have to trust that DJI looked and didn't see a motor problem, blade problem, battery problem, etc.
I'm not saying that DJI is 100% right in this, but without data from your side and no drone or real proof, there is nothing that can really be done.
It sucks, but I'm just saying not to put all the blame on DJI without real proof that it was there fault.