If I didn't know any better I would say that the person who had problems figuring out eye dominance has more problems than that. The first thing that popped into my mind was a questioning word, "lysdexia"?
when you close one of your eyes, you loose 35% depth perception......obviously one ye with a scope but try for two eyes using the shotty, or the good ole' irons. It also gives you a wider field of view!
As much as I HATE to admit that someone BESIDES me is right ...
I have been practicing two eyed shooting at over 10 yards. It is a bit weird, and I am not as fast with two eyes acquiring the site picture, yet. My mind is starting to "fade" the importance of the other eyes image. That is the only way I can describe it. The other rear site and other target is becoming "less significant" to my brain.
Another 2500 rounds and I might be good to go! Good thing I shoot 9mm not 45s!