It's a fair theory but this election seems to go against it.
Trump was not too right for the right. The establishment of the RNC was against him because he looked and had liberal ideas in many aspects.
Being politically incorrect may make him look "more extreme right" to the left but there's no evidence that he is (When compared, for example, with another important primary candidate like Ted Cruz).
I think you're touching on an important point here: the bits of the GOPs message that resonate with their base don't seem to match what the party thinks they are. Trump demonstrated a huge disconnect between the GOP and its own base.
Trump was not too right for the right. The establishment of the RNC was against him because he looked and had liberal ideas in many aspects.
Being politically incorrect may make him look "more extreme right" to the left but there's no evidence that he is (When compared, for example, with another important primary candidate like Ted Cruz).