Lesnar could definitely have had a longer MMA career its true if he'd have started earlier but I would say thats a bit different to what you were saying that he would be the GOAT.
Really Lesnar not wanting to go super hard in sparing I think thats probably part of his nature, he was never keen on putting his health at risk working the intensive WWE schedule either. I mean many would say he was/is actually quite inteligent in that reguard(if perhaps not with potential PED use) in looking after his health long term but I do think its the kind of mentality that would always have limited him as a MMA fighter.
I have to say really what makes Lesnar so different to someone like Mark Kerr? maybe a little more physical gifted but a little less technically gifted in sub grappling. It felt like people ingored history with the Brock hype, went back to the idea of the unstoppable super wrestler when really a 45 year old Randy giving up 60lbs shut down Lesnar's grappling.
Well, I think you lack a little objectivity.
Look., I HATED Lesnar with a passion.
but the dude fought for just 4 years. You gotta be fair here.
And like I said, when he started training, he was already a multi-millionaire megastar.
it is quite obvious that if he was to come straight from his wrestling days into MMA (without first passing by pro-wrestling), he would not have the power to tell a professional MMA coach in a reputable gym to not go hard on him. Or his sparing partners for that matter.
When start your training in a gym, you are no one. Respect is earned.
But when he decided to train, he built his own gym and brought coaches and hired his training partners.... it is obviously not the same thing!
on the same token, he did not know how to get hit.
A professional MMA fighter trains not to respond, not to give in that he got hurt. Lesnar had no training. It was visible! and yet he became the champ!
Look, call it whatever you wish, but I do think that with his size & Strength and basis Wrestling alone, he got to the top.
Train him since he was a kid, add years to his training (including fundamentals) and he would have been a force to be reckoned.