Although he is lighter than the normals in the group, I definitely would think that he is a normal het hypo. I am afraid that no matter what he looks like and what everyone's opinions are, though, that you are ONLY going to know for sure by breeding trials.
I owned two that looked hypo but proved out to be only het hypo. Here is a picture of them. So, If he were mine, I would call him a normal het hypo till breeding tests proved him out.