yeah i dont know what's up with that. first time i'm hearing many of the purely jatt surnames claiming rajput origins, including mine apparently too lol. i understand bhatti, janjua etc. as they are just rajputs, but never heard anything remotely like that from elders or family friends about other clans. i think the origin stuff on wiki is crap, probably edited by some rajput guy with a hard on for jatts lmao.
it's only accurate for the geographic presence of those clans as far as i can tell.
interesting theory. actually i was looking through 1911 census of jatt clans in punjab and can recognize nearly all of the surnames in list of gujrat and sargodha dist.'s, most of them under jhelum distt., but hardly any from rwp or mianwali (except overlapping ones ofc). i think you're right, the nucleus of punjabi jatts is central punjab, and on a gradient further west they have mixed or obscured lineages.
Jat clans of Rawalpindi Division - Wikipedia, the free encyclopedia
it's hard to tell, i've been trying to find out myself for a while. closest thing from the web is estimates based on 1931 census and growth rates since. like this
i would say given the magnitude of claims and self appointed titles, a reasonable estimate would be 8 to 10 million jatts - a little under 10% of Pak punjab. this is excluding kammis, rajputs, churas etc adopting jatt names lol. and probably similar number in east punjab where they comprise about half the population.