You speak about Meetra Surik having mastered many of the lightsaber forms, but it is well established that Yoda, during his 900 years, mastered ALL of the lightsaber forms, which i would think concludes that Surik doesn't stand a chance against Yoda. Concerning the most powerful, i am still going with Yoda, or possibly Luke, because Anakin really didn't get that amazingly strong, as he was cut down, and make quite the little android, which i think inhibited his Force abilities. Yoda has the wisdom, the mastering of the force and lightsaber forms alike, to make him, in my head, the most powerful Jedi