I think he would've lost quite a few fights there honestly. He's a great fighter, but he would've been giving up some serious weight. I mean, lets face it. he would've done well against some of the guys close to his size, but he would've been fighting Anderson Silva, Wanderlei Silva, Prime Hendo, Liddell, Rampage, Sakuraba, etc. If he did well with them, then pride would've done something crazy, like throw in Fujita, Fedor, Crocop, Mino, etc. Then, if he did good there, they'd throw in something crazy, I could see them signing a Bigfoot x GSP match. Then a Crocop+Fedor vs GSP match. Basically, throw him against bigger and bigger people until they killed him (kinda like they did with Sakuraba).
What about Jon Jones? 
Eventually he would eat a H bomb from Hendo! 
Give GSP the authorization to knee a downed opponent = no can defend.
Skpotamus - I think he would've lost quite a few fights there honestly. He's a great fighter, but he would've been giving up some serious weight. I mean, lets face it. he would've done well against some of the guys close to his size, but he would've been fighting Anderson Silva, Wanderlei Silva, Prime Hendo, Liddell, Rampage, Sakuraba, etc. If he did well with them, then pride would've done something crazy, like throw in Fujita, Fedor, Crocop, Mino, etc. Then, if he did good there, they'd throw in something crazy, I could see them signing a Bigfoot x GSP match. Then a Crocop+Fedor vs GSP match. Basically, throw him against bigger and bigger people until they killed him (kinda like they did with Sakuraba).
agreed 100%
Knees to grounded opponents = no can defend
He would have been fine.
Of course, if he had to fight up, thats a different story. Against his fellow WWs though, he would have been just as good though imo.
If pride had 170 then he would've done well
He would've fought 183 had he actually been there though. Lots of tough fights since he'd be outsized
How would he fair vs
Paulo Filho
Hendo
Misaki
Bustamante
Minowa
Ninja
Denis Kang
Baroni
At their primes