Even by your criteria no, what Tyron did isn't a fluke. Main reason being is he did it twice before using your mertic. As I pointed out earlier once you do something three times it's no longer a fluke, hell call it twice. I'm seeing a guy who has finished five guys in the first round via KO. And yes I include TKO as a KO if that's the disconnect in the three vs five here.
Lawler. Right hand followed by a swarming of more rights that gets the ref stoppage.
Kim. Right hand lands at end of spinning shit followed by swarming to get ref stoppage.
Koscheck. Right hook lands followed by more rights to get the ref stoppage.
Hieron. Right hand lands followed up with a swarming to get ref stoppage.
Galvao. Right hand lands that finally keeps him down before he follows up then gets the refs stoppage.
When keeping all that in mind (minus the Lawler example of course assuming we didn't know the outcome in question) no. I don't see any possible way somebody could have knowledge of that background and still watch Lawler go down and think it's a fluke. If you want to split hairs and seperate TKO/KO even after watching those clips fine. ESPN, UFC, Sherdog, Wiki, Tapology and other sites all list them as the one and the same. If someone has seen tape of Woodley coming into a fight and don't think a first round blitz KO is likely then they need a strong coaching staff to get get them up to speed.
but ultimately the vast majority of his wins comes via submission or decision.
No they don't, it's quite a balanced resume. Unless you're comparing two categories against one of course but that would be silly.