After reviewing everything, here is what I am thinking (all just my opinion/speculation of course):
I don't believe that there is any evidence strong enough to support a suicide or runaway theory.
I don't believe that Wesley was with an acquaintance.
I do believe that Wesley was carjacked with a dangerous weapon, possibly a gun, and forced to drive to or near Mission (the opposite direction of Burnaby, where he was supposed to have his doctor's appointment but never arrived).
I do believe that the small amount of his blood found in his truck could be consistent with a smaller head wound, I am thinking from an "intimidation" hit to the head - enough to scare but not disable him.
I do believe that Wesley was still driving the truck with the carjacker as the passenger when the truck was spotted driving too slowly along the highway, and that from there the truck headed North to Hayward lake.
I do believe (I feel sick typing this) that Wesley was "disposed of" somewhere near where his truck was found, and dumped in the water.
I don't believe that any calls were erased from Wesley's phone. I think the calls from work were not showing due to the phone being in a remote area with likely poor reception.
I would be much interested to hear what other sleuths have to say about all this. I know this isn't exactly a hot case, but Wesley's family still very much deserves answers. It is evident that he is very, very loved.