The tyre tracks don't matter. They were made after the crew lost control of the a/c.
Looks a lot like a plain stall. While an unlocked TR could have caused it, they'd be very unlucky to get that at Vr- which it would have had to have been to have caused this accident.
Hitting the tail hints at the kind of pitch up that the a/c s pusher is there to prevent- but it does not work that close to the ground- so that points to a stall also.
In other words if the TR had unlocked earlier than V1- they'd have stopped and if it happened after Vr they'd be airborne and have climbed some way. So while it maybe could be an unlocked TR.........
In my own experience, taxi back in for some reason-shutdown- start up and taxi out again is the IDEAL situation for missing something.
You've done the 'Runway checks', then you abort.
Right: do the 'after landing checks' (but it's not quite right as you've not 'just landed'). Maybe not put some things away as you expect to go again very soon?
Then you shut down- deal with pax, deal with whatever the problem was etc.
Then you taxi again, more checks etc, maybe you left some items as you knew you'd be going again. Speeds, for example "as before".
It's totally easy to miss something in the rush and I've always had to take it slow and try not to miss anything.
Say they retracted the flaps or slats on the way back in and forgot to redeploy them on the way out? Easy to do. Especially as they were now late and so on.
All you need is a failure in the config system to line up that last hole in the cheese......
