Mir had recently found himself among the heavyweight division's second-tier of fighters, but an impressive win over French kickboxer Cheick Kongo left an impression in many fans' minds.
According to who? If tier 1 fighter loses against another tier 1 fighter he doesn't drop down to tier 2 instantly. Mir was still top 5 HW in the world even after losing to Lesnar, just sadly for him in mma match there can only be 1 winner.
To me his position in HW ranking remained exactly same, he was #3 (Fedor being #1 and Brock being #2) after beating Nog and losing to Brock, and Kongo win didn't really make him pass anyone.
Rankings and title shots however don't go hand to hand though like I said on another topic (for a good reason), if we went with "you need to be #2 in division to fight #1" we would have GSP fighting fitch on and on and once in a while fitch would defend his #2 position.
Basically though I wouldn't mind Mir fighting Silva next (which is what Silva wanted too) or something, because I want to see Brock vs. Carwin fight before Mir vs. Lesnar III, other than Carwin and Silva there really isn't anyone worth mentioning free to fight Mir as Nog, JDS and Cain are all booked for different fights.
Then again, Mir vs. GG could be awesome fight. 2 Huge bjj blackbelts with underrated yet devastating stand up. We could see more of Mir's improved boxing on that fight or even an epic ground war bitween 2 of the best "mma grapplers" in business. I use the term "mma grappler", because while there are people with better jitsu credentials around in ufc, I can't think of too many guys who have converted their pure jitsu skills so well into mma.