I agree with you about finding the "Frank Shamrock was the first true/well-rounded mixed martial artist" thing tiresome, but this is overstating the case. Leaving aside Horn trying to blow smoke up his own ass, I think that what is being overlooked here is Frank's style of fighting. Not only did he have absolutely no qualms about giving up positions or giving away time to his opponent, but coming from Pancrase he had a very loose grappling style, and one that was specifically not BJJ but rather catch wrestling. So the "his jiujitsu is garbage" thing is just ignorant, as he wasn't trained in BJJ, and the shit about positional dominance simply didn't register to Frank because position didn't mean shit in Pancrase - all that mattered was the tap. And as we all know, Horn is the one who tapped.
Rizzo was the first truly effective sprawl-and-brawler. Someone like Bas just conceded the TD and got really good at submissions so that when he got taken down he'd be able to go from knocking you out on the feet to tapping you on the ground, while someone like Maurice Smith also conceded the TD and developed a really good defensive guard to wait out the time on the ground without taking too much damage before getting back up to the feet. But Rizzo wouldn't concede the TD. He wanted you standing in front of him so that he could throw punches and low kicks. And while he was never as aggressive as he should've been, he nevertheless showed the effectiveness of what came to be known as sprawl-and-brawl.
This is a bit misleading. This makes it sound like the fight was Rizzo's early but Randy took it away from him. In fact, it was all Randy at the start, who violently took Rizzo down against the fence and just pulverized him from within the guard to where he nearly stopped the fight in the first round. In going at Rizzo so aggressively, however, Randy punched himself out, and Rizzo took the fight over until Randy got his second wind and was able to fight hard enough to take back enough of the fight to get the decision.
I don't recall Randy ever having anything done to his leg, but I seem to recall him saying that he still has a dent in his leg from the kicks
Jeff Blatnick is the most underrated commentator ever. Bas Rutten is the best fighter commentator ever in my book, while Jeff Blatnick is the best non-fighter commentator. Granted, like Joe coming from TKD and then learning MT and BJJ, Blatnick of course comes from a wrestling background, so it's not like MMA was completely foreign to him. But still, he wasn't a fighter yet he loved the sport and was both a true student and fan of the game, and that always came through on the mic.
Rizzo was more effective. Igor had a great pancake sprawl, but he'd still get taken down a ton, by plenty of people with subpar (or at the very least not elite) wrestling, and especially if you clinched or followed up your shot you had a good chance of getting him down. Rizzo, by contrast, stopped a ton of shots from truly elite wrestlers, and if you weren't an elite wrestler then you were going to be in for a very long and painful night in Low Kick City