Hi FBM, I don't see how anatta can be "realized" with reasoning. Reasoning can bring us to some kind of conclusion, or even firm conviction, but it's not in the same league as realization. In my opinion, Buddha didn't set out up front to present a formal doctrine based on something he'd reasoned out. He reported what he actually discovered - no more, no less. The mistake is to treat anatta like a philosophical stance or a kind of ontology, an "ultimate" as opposed to... whatever...