I hope Dana wouldn't live up to the hype of Koschek calling out Diego and put them in the ring before Diego faces Hughes or Penn (assuming he takes out Riggs) because Koschek, even though is improving rapidly needs to hang with someone in Kairo's caliber before deserving another rematch with Diego where Diego's has already earned his place, Josh should do the same... However, if Diego would lose to Riggs bring on Josh baby!
Don't be suprised if they do put Sanchez vs. Koscheck next. Dana knows theirs a lot more people that wanna see TUF rivalry rights than actual MMA ladder-climbing matches (GG Tuf show!) Unfortunately for us, (people that actually enjoy good fights) there's a lot more TUF viewers than there are MMA fans.
Seriously though, I wouldn't doubt they put Kos next, but it's likely to happen if Riggs loses and Koscheck wins his fight. Otherwise, probably not.