Would Daigo be loved and respected as much if he randomly decided to stop competing during top 8s or even grand finals because he's unhappy with the responsiveness of his stick, monitor lag, the lighting of the room, because he made a bad read or because he's getting outplayed/perfected first round? Would Daigo be looked upon as an inspiration and remembered as a top class player if he was known to rage quit mid game and rarely or never gave props to his opponents? If he had a long and repeated history of colluding, basically stop giving a shit, playing a trash character in a bad matchup just to let his friends win? If Daigo always showed up late and DQ'd himself because he wanted to be treated like a Diva with privileges, would it change people's perception of him? Of course. He would even lose 80% of credibility and respect, which would take away a ton of great potential sponsorships, gaming, FGC and non-FGC related opportunities. His books wouldn't sell as well, they might even be a failure (if he even writes a book because he probably wouldn't care about the next generation of players so he wouldn't even try to level them up.). He could have more trouble finding a GF to reproduce with since most girls don't like manchilds (lol).
Daigo would basically be 20% of what Daigo is. And not being loved and respected as much would directly affect his mood, his focus and his results. Meaning, in such an alternate universe, Daigo would never achieve half of what he did achieve if he had such an attitude/personality.
He would still be considered a great player and a threat in tournaments. But he would never be considered "the best". That title would go to another multi-game world class player worthy of such title. Like Tokido or Fuudo. Daigo would just be remembered as that douche who could've been amazing if he wasn't such a bitch.