I mean, of the guys you mentioned I would only slightly favor GM3 and Jacare over Kyle, and that's because of their own grappling.
Buckley's whole style hinges on his athleticism and is incredibly compact for the division, even a very unremarkable Arroyo was having success against him due to his length alone. Alessio and Stewart are both right around the level of guys I think Daukaus would beat, with Alessio maybe giving Kyle a tougher fight (big maybe since he had no clue how to defend a triangle choke against Spicely) since Darren couldn't even muster up any sort of defense against Fabinski's takedowns, was a turtle off his back and has looked awful since the Holland fight.
You may be right, but Kevin's streak lacks a lot of depth, hell, his win over Gerald is contentious, so I don't buy that he's a top fighter. I faded him in his last three fights (wrong about the Jacare one) since Kevin has always had issues with being too content off of his back, and what Kyle might lack in strength compared to Derek and Marvin he makes up for having a more developed BJJ game in terms of variety.
And it's not like Daukaus is small himself, mind you. Remember that Kevin was talking about dropping down to WW after the Brunson fight, so him getting overpowered again isn't that farfetched. I do believe that if he's to lose, it'll be in similar fashion as he did to Allen, getting outscrambled rather than outmuscled.