Absolutely. If I had a clear, unmistakable, up close experience? Yes. That is also part of what makes me lean towards the gaming theory. Witnesses and believers do not really behave like someone who just saw an unclassified 9 foot ape-man. They just don't.
I would shout it from the roof tops and not give up until it was proven. And I think that is a pretty normal reaction. Not the casual shrug and " oh that was cool, let's go talk about this with a dozen people on the internet". No. That does not jive.
And here's the thing. If this animal was real, then a long time ago a perfectly normal reaction of a witness would have led to confirmation and we'd have them in zoos or conservancies, etc. A long time ago.
I would think yes. We can pluck DNA out of the environment now. Literally. A stick nest is going to poke and prod and snag all over the body. It would not just be hair, but skin samples, fecal, urine, saliva, you name it. But nothing is ever produced from these.
This is interesting:
Species detection using environmental DNA from water samples Gentile Francesco Ficetola1,2,*, Claude Miaud2,Franc ̧ois Pompanon1and Pierre Taberlet
"The reliability of the results was demonstrated by the identification of amplified DNA fragments, using traditional sequencing and parallel pyrosequen-cing techniques. As the environment can retain the molecular imprint of inhabiting species, our approach allows the reliable detection of secretive organisms in wetlands without direct observation"