We would love to see some good photos of him, esp of the sides, back, and head.
It sure looks like an Oci to me. I have the same question. Got a rescue kitten last month and now I see that he has developed SPOTS on his sides, toard the back. Not a total Oci but I have a feeling he's part Oci. And since they were bred in Michigan, which is where I am, maybe he's one that got lost.