It's honestly the best move to make for both of them because if they made Conor vs Tony and Tony wins -- the opportunity for arguably the biggest fight in LW history would be taken away from them as there is no hype behind Tony and he doesn't command not even the 1/100th of the attention that Conor can bring.
Dana is smart and is really great friends with Conor so him and Conor have probably strategized that this is the best move to make for both of them. If Conor gets stripped and Khabib wins against Tony, Conor and Khabib will fight in Russia which is one of the biggest MMA hotspots in the world and it will be the first time UFC is entering the Russian market - now just imagine if Conor wins against Khabib in his own turf in a stadium filled to the brim with hardcore Russian MMA fans? Imagine how much bigger he will bigger? Imagine if Khabib beats Conor? Imagine how bigger he will be, imagine how much more attention there will be for MMA and the UFC from the Russian demographic? It's a win-win for everybody to make this fight.