I get that Big Daddy had the celebrity status of any of the names you've mentioned, but he was never tested like they were. Big Daddy was featured in the Sunday comics, so of course you'd cheer for him when he had that negative five-star match against Giant Haytacks. Stan Hansen left lasting impressions on the fans when he'd dominate big names like Giant Baba and Vader.
Match quality isn't the point, or more appropriately not the only point. Ability to draw, relevance to this industry, historical importance. All are fields where Daddy's legacy is greater than Hansen's.
I know that I'd be fooling myself if I pretended like it was my place to lecture you, so rest assured I'm just making the following point so that you're aware of what I'm aware of. Do you remember when Stan and Vader has a small miscommunication prior to their most memorable match in Japan? Something like Stan was wildly swinging his bull rope around and the bell on the end of it thwacked Vader in the head, inspiring Vader to potato Stan for which Stan had no idea of why Vader did that? Vader almost lost an eye during that match.
Stan had a chip on his shoulder, and prior to his matches he would put himself into a mental state where you had to be a tough son of a bitch or a prowrestling mainstay to be able to beat him.
I'll give you that Stan swallowed his pride for his match with Hogan, but I'm going to need more convincing to look at Big Daddy as another version of Hogan. Hogan is often mocked for having a leg drop as a finisher, if Big Daddy attempted a leg drop he would never walk again.
Daddy isn't going to play the Vader game though, is he? Vader's a tough rough and ready type much like Hansen himself. Daddy's, by your own account, a softy. He'd get the hell out of dodge, but that's all beside the point. This isn't a legit fight. It's a work. Hansen hitting Vader was an accident. If he hits Daddy by accident, the match will get thrown out. Hansen might go into business for himself or what have you afterward, but he'd be DQ'd, thrown out.
I completely agree that being a top heel shouldn't be a free ticket to the second round, but we're talking about Big Daddy here. Stan Hansen had a match with Bruno Sammartino that everyone from that era remembers, and Big Daddy had a match with Big Bruno Elrington that nobody remembers.
Of course I get your point, I don't think anyone is arguing that Stan Hansen is a much superior in-ring talent. The point is he's not the big star in the same way Daddy was. Daddy's popularity sparked the biggest wrestling boom the UK (probably the fourth biggest wrestling market outside of North America, Mexico and Japan) has ever seen and that has never been replicated after his peak. Hansen was a big deal and a legendary villain but he never supported the weight of an industry like Daddy did.
I feel like you're trying to convince me that the most popular wrestler in an obscure indy league deserves to beat one of the most popular wresters in the world. World of Sport was at best a carnival side show. Stan Hansen spent his career mixing it up with the greatest from around the world, and Big Daddy wouldn't have lasted a minute anywhere else.
See this is simply not true. World of Sport was a mainstream product. It was designed for the masses as a convenient way of showcasing all sports, and the wrestling aspect was the most viewed and best remembered aspect of it (aside from, darts maybe). There was nothing indy about it. Carny perhaps, but the fact it was funded by the biggest advertisement supported broadcaster in the UK means there isn't anything indy about it.
You want to talk laughable? Imagine Big Daddy in a match with or against any of the people you've cited as examples of why Stan would lose because he's the bad guy. I honestly think it would look pretty fucking funny to see Hogan, Bruno or Luger torture themselves trying to make a match against or teamed up with Big Daddy look even slightly decent. On the flip side, Stan would easily destroy any of Big Daddy's usual mix of foils.
This isn't a straight fight. I get it, Hansen's the toughest, he's the great cowboy, all that. Daddy's a clown, a jolly giant. But it's a work. The whole point is to bump and make your opponent look good. Hansen might get annoyed because Daddy isn't his caliber of opponent, but if he takes it too far and starts potatoing him, he'll get DQ'd. This isn't Japan or the Deep South, if Hansen hits him with a bullrope, he gets DQ'd. If he spits tobacco at him, that's no different to the mist(s), he'll get DQ'd. Hell, if he uses closed fists for a prolonged period, he gets DQ'd.
Daddy was a mega-star in his market, Hansen was a big deal, but nothing is going to collapse without him at the helm.