I would like to point out on this thread that there is no reason to think that all tulpas function the same way. There is no way to know that. It is entirely possible that there are variations in what people are experiencing and still calling a tulpa. My hostie and I happen to think it doesn't matter really. If it feels like a tulpa and is a profound and persistent experience, and you wanna call it a tulpa, it's a tulpa. That is true no matter if the tulpa is a figment of your own consciousness or a fully independent mind from your own.
So what I am saying is that this theory may be correct for some, that tulpas are a skill, and not so correct for others. The disagreement and controversy is unnecessary. No one needs to be threatened by the existence of such a theory.