Definitely kalenjin with heavy admixture of turkana..which is nothing unique given each kalenjin have heavy admixture of their neighbours..gusii,maasai and luhyas...pokots though do not care about that..attacking and raiding kalenjin just as well as their other neighbours.
I have always thought Pokot were a different group from the other Kalenjins. A bit like Marakwet but on steroids. At least that was the impression way back when I spent some decent time in the Rift Valley. Their incorporation to the mainstream Kalenjin seems like a relatively recent development.
I have no doubt about their genetic kinship. They are Kalenjin. They just did not consider themselves as part of the larger group until fairly recently; post-colonial times. Their language differences probably delayed it further.
Ultimately it comes down to what they think of themselves. Marakwet for instance are Kalenjin because they have considered themselves as such for a long time. Even though their language is relatively different.
Africa has quite a few such cases. Igbo did not realize they were one tribe until bazungu told them. It took a bazungu to make them realize a kinship that would be immediately apparent to any outsider. The outsider usually has the advantage of a wider perspective.
The largest ethnic groups in Africa that did not have kingdoms are more or less the same.