Where Blaze was found says a lot to me, though I may be wrong. It does not seem at all like an accident for him to be found by that field where kids play. I get this in your faces emotion of sorts being expressed through the crime and the placement. A bringing down of Blaze and other kids who may have played on that field, who knows? A crime intended for an audience of sorts in the perp's mind on some level, it seems possible. That would have included forethought and some level of planning it seems to me, to begin with, not a last minute choice after an accident. And the forethought to keep their contact undetectable, thus the nature of the luring a mystery, as you point out AnaPisces, seems completely possible as a perp's forethought as well.
The perp/s would have had all the time in world to take and place Blaze where he would have been harder to find, it seems, based on when Blaze left home as reported and when his phone was turned off. So, why choose there? It all seems so staged to me, from the start, based on everything reported about the driver's accounts in MSM, and now especially based on where he was found.