This is the craziest theory but it all works out.
Let's see if ohma gaoh and the hooded man are clones of gaoh mukaku and the tiger container is a perfect body for someone old who wants to transfer his body to the body of mulaku for his hasañas inside and to meet Niko ohma and see the resemblance With his teacher he worried and decided to go with Kuroki to investigate and they rescued Gaoh and to this being the youngest clone they decided that Gaoh will stay with one and Niko with another and the hooded man considers himself the real tiger as he is the original maybe have a similar age to that of ohma but this and ohma came out too violent and unstable but they caught one and the other escaped and gaoh is the perfected version of the clone and that is why naidan has so many expectations in him
(I know that it is a little badly told and that Kuroko's participation may be strange why why didn't he tell ohma or something like that but maybe he did not participate fully since what he wanted to continue is his training and Niko has just uncovered everything something like this is the theory that seems more correct and with less gaps) (I would also like it to be Setsuna)
(Sorry for the spelling mistakes that are in the text, I was excited)
I also want to add two things (well if you read the previous text a little more it will not be bad) the first is that the gu rituals were probably to find successors or artificial tigers to which the niko style was taught and they were put to kill each other to see who had the best talent, but that these were very expensive to perform since not only did they have to find young talented boys, but as we saw the places where these rituals were performed were extremely specific and once they are found they have to be discarded and that is why they stopped being carried out and began with cloning.
the second was ohma's behavior since this is strange since this is very volatin and I think it is because of the niko style since once he learned it he calmed down when he left him for the death of his teacher he went crazy again and when he perfection calmed down really if they are clones they could also put a program to learn the niko style and that was what made them violent and their extreme desire to be strong in addition to their environment, but the guy was absurdly violent since the more he learned the more He relaxed that even Jimuro also came from the inside and had talent and was not so violent, it can also be a somewhat forced development, but this would give more substance to Ohma and a reason for him to be alive since this would give him a brutal importance in history.