Originally Posted by Fat Curtains
The difference is manaphy and excadrill are powerful pokemon regardless of weather. The weather just takes them over the top. you can switch a ninetales or tyranitar into a manaphy and get koed by +6 surf/hydro pump. You can switch a ninetales into excadrill and get koed by +2 earthquake or rock slide. With changing the weather you kill torn-t's trump card: a 100% accurate hurricane. Then all you have is a piss weak u-turn and superpower.
Excadrill is nowhere near broken without Sand Rush. It is far too slow to do anything in OU.
Manaphy's CM set would be outclassed by Keldeo and the Tail Glow set fails to defeat Jellicent or Blissey and would be prone to being revenge killed easily.
You can't ignore certain factors about a Pokemon to make them seem more tame. That is not the point of this discussion. We are looking at both Tornadus-T and Keldeo, including every aspect of their potential.