Anyone who said "Dr. A should not be learning spelling from Yvain, Yvain should be learning science from Dr. A" would be missing the point. If Dr. A wants to learn spelling, he might as well learn it from me. And best of all if we both learn from each other!

I believe that formally, the best of all is if you and Dr. A employ comparative advantage, with him doing your science and you doing his spelling.