I'm no expert in genetics, but wouldn't he be overo?
I was under the impression that tobiano accounted for solid legs, solid face, and shield like white markings, typically over the hind quarters and shoulders.
Unless they can be backwards? (As in... the sorrel being the 'shield like markings'). Even so, I thought that said markings had to cross over the back for it to qualify as tobiano?
I know very little about color genetics, so correct me if I'm wrong!
The sensitivity of the internet baffles me.