Fedor fought guys who literally double his weight. BJ Penn fought over 4-5 weight classes with a span of 50+ lbs
Mighty Mouse walks around at the mid 140s. He could make FW and LW with zero difficulty, literally.
You know how people would 100% care about Mighty Mouse? If he beats Conor, Aldo, RDA and Khabib. His stock would rise 10 fold, people would WOW at his ability to destroy bigger opponents, his salary and marketability would increase 10 fold and nobody would give 2 shits about whether he talks shit or not. Heck, he'd make the biggest payday of his life by destroying Conor alone. He probably won't reach Rousey level of casual star power, but he would be top 3 instead of dead last.
This is 100% doable, does not involve any trash talk or promotion that he hates, and is all about fighting ability, and yet Mighty Mouse continue to refuse to challenge himself, and asks the rhetorical quesiton "what do you want me to do"? Want to increase your insignificant stock? Easy. MOVE UP IN WEIGHT and FIGHT BIGGER GUYS like everyone is doing in boxing. The biggest male star in the UFC is at 145 lbs. Fight him, beat him.