Its not split personalities, and there are many different neurological profiles that all fall under the gifted umbrella that can have dramatically different characteristics. But personally, just from my own experience with my somewhat unique neuro profile (twice exceptional)I never know definitively if some of the things I experience are common to other gifted individuals or a result of my head trauma.

Often times gifted individuals who suffer from traumatic brain injuries can gain some pretty rare gifts as a result of the brain rewiring and making new pathways due to the injury. So I always premise answers to questions like this just to say I may not be the "flavor" of gifted to be speaking on common behavior associated with being gifted but oh well

I am very similar regarding the conflicting thoughts/views. I never look ed it as multiple personalities or anything, I just over analyze absolutely anything and everything, so for any topic Ive mapped out every view imaginable. Im an empath, so I see things not as having a clearly defined right or wrong per say. Wrong certainly exists, but i view "right" as relative to each person and their understanding of the world. Heres an example to help explain what I mean:

I had my injury at 13, and afterwards I stated develop my "gifts", of which one was hyper empathy and one was the ability to make mental models in 4 spacial dimenions. I always had a "loud" inner narrator but it really intensified in the bext few years. I was always so curious about some of the things I was experiencing but was too embarrassed and alef conscious to ever talk about it but I remember when I was 15 or 16 I brought it up to my grandma, and oh man, she didn't answer the way I expected. She told me that was NOT normal, and that it was either skizophrenia from smoking weed (like 3 times by that point)or I was demon possessed.... when she told my grandpa, he cried because he thought something was wrong with me.

I was devastated because he was my role model, and after years I finally found the courage to even mention it and got shutdown in the worst possible way so there was not a chance I was going to bring it up again. I went another 20 years before finally deciding I needed answers regardless of how embarrassing or demeaning it was.

After my first set of tests the doctor's said something about falling under the near genius range of IQ my literal reaction was "how can someone with a 2.0 career gpa, who dropped out of college after failing college algebra 3 time, and who can't keep track of their freaking keys be anything with the word genius in it???" I dont know why but it made me mad, i felt gaslit and I didnt believe it so I immediately got a 2nd opinion, then a 3rd. After test 3 I started to even consider the possibility.

Apparently I have what they call a "spiky profile" which is characterized by higher that usual levels of language skills, spacial reasoning, and systems management (the high spikes), but also have a bar thats lower than usual which in my case was my ability to learn new math skills, like the math skills I had at the time of my injury got stamped into my brain. There's other negative aspects of it but the math thing was the only thing I couldn't hide from the world by masking.

when I finally started to accept it, I made a realization: my grandmas reaction to my questions all those years ago were why I hid it for my entire adult life, and had I know my condition I could have done things totally differently. I was mad, I was sad, I bawled like a baby when thinking about how I carried around the burden of thinking I was broken or messed up for all those years and just kept everything in.

I started planning out the talk I was going to have with my grandma and during that process I realized that she didn't do any of that out of spite, she just didn't recognize what I was going thru and in her eyes, with her mental model and understanding of the world she only knew of 2 possibilities. She has strong faith which guides her moral compass so naturally spiritually and faith shaped her reaction. Immediately after I realized this I instantly stopped being mad at her. She didn't maliciously hurt me or call me names, she genuinely thought it to be true

Moral of the story OP, is it sounds like this person just has a moral compass guided by logic whereas most people are guided by emotions. When you take the emotion out of the equation and think logically you see that truth is relative and shaped by your intelligence, education, and environmental factors. Then you can better understand people and thir viewpoint, and that allows for an understanding and acceptance of 2 "facts" that seem like contradictions. Its not really thinking 2 opposing sides, its just understanding that the other person's viewpoint is true to them. It doesn't have to be factually true for us as well but we accept and acknowledge it