GSP who happens to lift weights a ton too.
To be fair, GSP does almost no PLing. Mostly gymnastics, stability work and plyos. He does a lot of odd stuff too.
http://www.bodybuilding.com/fun/train-like-striking-truth-star-georges-st-pierre.html
Also, in regards to the topic. Tristar is a very good gym. Say what you want about Firas, and I personally don't like him, but he knows fighting. GSP, Rory, Florian, Makdessi, Menjivar, Kang, Carmont and Taleb are all out of Tristar. Wonderboy is an affiliate there too. But yes, a lot of what he says is unfounded, and some of the books he recommended, yikes!
He is right that time spent on the mats is better than time spent lifting heavy though, at least for beginners. As he laid out, person A is doing five 1 hour classes a week BJJ, person B is doing three 1 hour classes and two strenght days a week. Both start BJJ at the same time with no experience and both have let's say even barbell strenght. In a year, person A has 240 hours on the mat, person B has 144 hours. Person B has also increased his or her lifts by lets say(let's say they are novice, but past newbie gains) squat by 60lbs, dl by 80lbs, bench by 15lbs and OHP by 12lbs. Obvously when you are doing BJJ and are past the newbie stage, increasing lifts takes time, so I might be generous here.
One has increased Squat from let's say 220 to 280lbs and so forth.
The other has almost a 100 hours more on the mat.
Who would you favour in sparring? Keep in mind, rolling and sparring is not prancing around. You build endurance and strenght, especially grip strenght, and you learn to use your strenght a lot better. Motor patterns are much better, and the guy would know more techniques and have practiced them more.
I think it's a give and take. IMO, a person should start a good all around S&C program for maybe 6-8 months to strenghten ligaments, bones, build muscle, target weaknesses, optimise cardiovascular functions, perhaps lose weight and prevent injuries. Slowly building a base and towards the last few months start doing very heavy lifts and plyos. Then a person should begin their martial art and put strenght training on the back end for a while. Maybe a few maintanence workouts a month, and LEARN their martial arts. Spend time on the mat, spend time on the pads, spend time sparring, spend time rolling, study the moves, practice footwork and so forth ad nauseam! Then, when a person gets comfortable, slowly start introducing strenght training again and periodize it in blocks. When the point of diminishing returns gets too great, just maintain and work on other stuff.
To be clear, what I mean here by strenght training is barbell training/PLing.
That's how I see it anyways.