The Pole Stamina is out. Nicolai does customs, if you need, but you should be okay with a 200 mm dropper post.
If you can track down a previous generation Guerrilla Gravity (fully aluminum frame), the normalized reaches for XL are 541 - 543 mm and the seat tubes are 533 mm.
“First of all, I would want you to re-do that inseam measurement, because 36 inches is a very short inseam for a 6-foot-5-inch rider. Perhaps that is your pants inseam size, which runs about two inches shorter than the actual inseam measurement from crotch to floor in stocking feet; 38 inches is an average inseam for a 6-foot-5-inch rider.”
Reach out Reggie Miller. Yes that Reggie Miller who played in the NBA. He is an Avid MTN biker and Racer. (and he is good). He is 6'8" and he rides a XXL Santa Cruz High Tower.
He will respond to you thru Instagram. He is a pretty cool guy who is responsive to other Mtn Bikers. I'm sure he will give you some ideas and pointers of fitting since he has had to go thru it. you can reach him on instragram - https://www.instagram.com/reggiemillertnt/?hl=en