Make the six eyes a martial soul. It just doesn't make sense for a person to have that kind of ability. Douluo dalu is not that kind of world. If you have a lineage, it manifests as a martial soul. Also you don't need to think too much, you can make each ring represent an improvement in their overall abilities. Or you can also add skills like Huo Yuhao's. It would be easier for you to develop the six eyes with a reference point. Awakening a second martial soul after a few years is something that makes sense within DD. Thanks for the chapters.
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LIKEI didn't read the later parts either but bloodline affects the martial soul, like tang something I forgot(I think tang san grandson) his martial soul blue silver grass evolved from the bloodline of the golden Dragon King it became a golden silver grass, in the case of martial souls I don't know much but you can obtain different martial soul from spiritual beasts sacrifice(you can see the mc of DD 2 for more details)
I think idk if it's canon but it's about how martial soul is connected to the soul hence is hereditary and the six eyes being an innate ability which can influence mental power by just existing can be classified as a second martial soul also since it's a perk got form ROB meaning it can't be taken (probably idk) and be seen as an eye mutation like yuhao and like how yuhao passed some of it to his children in the form of different eye martial soul you get it haha also the technique in higher levels should get him a physique that can also level up with the technique starting with hmmmm how about natural affinity physique which makes him have affinity to the world hence all affinities with increase in physical strength, you know I want to say this is broken but lan xuanyu is more broken dude can fight 30+ level above him *stare deadpandedly*