[blam]

"Xinjiang belongs to Central Asia, a place where Iranic and Indic tribes were known to have roamed for millennia. "

These 'Celtic-like' people were in the area prior to any Iranian or Indian tribes, they did come later though.

[Cronos]

These 'Celtic-like' people were in the area prior to any Iranian or Indian tribes, they did come later though

I don't know on what basis you call them 'Celtic-like'. There doesn't seem to be a valid reason for that. Celtic is not a race, it's a language group. The 'sub-races' in the main three branches are very difficult to separate unless we take extreme examples and mostly not even then (except for Afroids).

What I mean by that is that there is next to no pointable standard diversity between the sub-groupings in the Caucasian or Mongoloid races. Afroids have a lot more diversity. I think this was proved genetically as well giving credence to the out of Africa theory.