It'd make more sense if you said "he'll never be able to hang with Khabib and won't become champ again" but you're insinuating that he wouldn't even have success against the top 10 at LW.
Let's not sit here and act like this wouldn't be re-done on most of the top 10.
At the time current LW champ Eddie Alvarez getting KO'd
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Current interim LW champion Dustin Poirier getting KO'd.
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I understand Dustin has improved greatly, but I don't think the Conor that fought Dustin would beat Jose Aldo. Conor is still a hard match up for Poirier and he'd probably KO him again. Dustin tends to get KO'd by fast, hard hitting south paws.
Khabib
Dustin Poirier
Tony Ferguson
Conor McGregor
Donald Cerrone
Justin Gaethje
Al Iaquinta
Edson Barboza
Anthony Pettis
Kevin Lee
Paul Felder
If you can really look at guys like Paul Felder, Anthony Pettis, Edson Barboza, Al Iaquinta, Donald Cerrone, and Kevin Lee and claim that they all beat Conor easily, then I don't know what to say.
The only offensive grappler in there is Kevin Lee. His cardio is worse than Conor's and he's already been chinned.
Al Iaquinta is tough but he got dropped several times his last fight and always looks to stand and bang.
Paul Felder got out classed by Edson Barboza in a UD
Anthony Pettis struggles against pressure strikers like Tony Ferguson. Also got out struck by Edson Barboza
Edson Barboza has been KO'd stiff several times and throws the same strikes every fight.