Taisumov has a professional record of 26-5. Many of the ranked fighters dream of a resume like that, lol.
They are ducking him, plain and simple. Ranked fighters nowadays only cherry-pick their fights, even coming off a loss - and people defending that are the worst.
Guys like Chiesa should fight an unranked guy to prove themselves worthy of the Top 10, if every ranked guy just cherry-picks other ranked guys then the division is stagnant. Do you support that?
Taisumov has a 5 straight KO/TKO winstreak. Show me one fighter with that kind of resume that doesn't get a ranked fighter.
Yair Rodriguez for example, had a UFC streak comparable with Taisumov's. Less finishes though.
He got Frankie Edgar because UFC decided to give him a few gimme fights (against washed up BJ Penn for example) and decided to push him as the next big thing.