Got it! So because "pinto" encompasses a description of a set of colorings like tobiano, sabino, paint, splash, etc... He is "pinto" in color. Whereas because "Paints" are an actual breed, he cannot be a paint unless his lineage supports a sire who was a paint, regardless of whether the sire (hypothetical paint sire) was pinto or solid.
So what would I call him? Just a percheron cross?
And MissyMay, Paints are their own breed. They do have a lot of interbreeding with QHs and TBs, but tobiano doesn't exist in either of those breeds, so they are their own distinguished breed.