The press release qualified the statement 'believed to have no injuries' was based upon the lack of blood.
The speculation about a possible head injury was based upon his stripping of his clothes 900 feet away, having walked that long carrying what was probably a heavy enough back pack.
A brain bleed will cause a raised temperature. a brain bleed is not concussion, a person may remain conscious for quite a while after having sustained one.
It is a possibility still.
Against that is that he had the presence of mind to take his backpack, to leave the keys for the breaker yard and to take his wallet.
BUT, a brain bleed is not always apparent immediately and he engaged in physical exercise, walking, immediately, possibly, afterwards.
Vehicle was allegedly not there at 11.30pm.
WAS there at 12.30pm and the person, Jason, had already walked a significant distance.
That leaves a short enough window.
A lack of blood at a scene is an inadequate fact to qualify a lack of serious injury or a reason to not investigate more thoroughly or mount an immediate search for the accident victim.
The removal of the vehicle from the scene when it was posing zero threat to other road users, it was in a field, quite a way from the road, is a tad strange.
His ultimate destination that night is moot because he had no way to contact anybody having misplaced his phone.