Read almost any post where somebody is trying to describe their tulpa, and you'll see very obvious attempts to show how unique their tulpa is or how it falls into some unprecedented category or how they created it in some special way.

Given that tulpa are probably strongly influenced by the hosts beliefs I wouldn't expect all tulpas to be exactly the same. I would expect most tulpa's to be unique in some sense.

I also would expect that given the effort that involved in creating a tulpa that people do vary the protocol.

None of the sources posted offer any sort of good evidence that people who claim to have tulpas have any sort of advantages.

"Good evidence" depends on your priors. For me the evidence that exists is good enough to find the phenomena interesting and worthy of further attention.