Jukain, so you want A- rank, okay, but Tornadus-T needs to be placed somewhere in A rank territory. Tornadus-T is very good.252 SpA Life Orb Tornadus-T Air Slash vs. 252 HP / 4 SpD Assault Vest Conkeldurr: 268-320 (64.7 - 77.2%) -- guaranteed 2HKO
while
252+ Atk Conkeldurr Ice Punch vs. 0 HP / 0- Def Tornadus-T: 254-300 (84.9 - 100.3%) -- 6.3% chance to OHKO
and
252+ Atk Conkeldurr Mach Punch vs. 0 HP / 0- Def Tornadus-T: 51-60 (17 - 20%) -- possible 5HKO
Tornadus-t is not a great check to conk since it mostly runs AV. You can't switch in on an attack and you have to rely on the super reliable hurricane to do any real damage.
While Hurricane does have a good shot at killing, most people really don't wanna risk hurricane when you have a much more reliable option in air slash.
If you run hurricane, you're most reliable move might be superpower (not good) knock off (not too great) or u-turn (no). None of those should be your go-to move if you want to do damage. The chance of hurricane even hitting twice is 49%, do you really want to rely on THOSE odds? Even if hurricane hits, you have to rely on one of the other moves mentioned to kill your target, and it might not!
Ultimately, hurricane is pretty irrelevant in comparison to air slash, it shouldn't even be brought up outside of rain.
Think of it this way:
If alakazam had access to aura sphere, do you think focus blast would see much usage? Would focus blast even be considered a viable option when something as reliable as aura sphere exists? probably not :/
Srn, you said that Zam would use Aura Sphere > Focus Blast, well, you're forgetting that's not its main STAB move. Hurricane + Air Slash together form something where you can choose a reliable STAB move not a coverage move which you almost always use to hit things SE. In fact, Conkeldurr cannot switch into the most common moveset in Air Slash / Focus Blast / Knock Off / U-turn so I don't see why your giving that calc. Can't switch into Focus Blast since Air Slash will ko next turn and Knock Off takes away AV allowing you to maul it w/ air slash. U-turn on it and you can gain a FREE TURN which is one of the reasons its really good while regen heals it up. Really fast U-turn makes it good. Tornadus-T can't switch into conk? yes, thats true but if its weakened enough, Air Slash kills. IDK what your thinking but a median of 72% damage is alot.
Life Orb Air Slash can't be switched into easily without suffering a 2HKO by it or Air Slash + Coverage Move. It then heals up any damage it took like recoil or Stealth Rock. U-turn + Regenerator gives it another reason why its so good and Knock Off buff makes it really good too. It can even set-up its own rain with the free turns it creates. Too high for B+ Rank imo.