I'd say Hoth, but that's purely speculation. He was seemingly very physically strong and in good shape (toned) and was the leader of the Army of Light. He was more of a warrior than a diplomat, and he also believed that he had the ability to singlehandedly defeat the sith, so I'm guessing he was probably the strongest jedi at the time, and that was a very martial era of jedi. I'd even go as far as to speculate that he was on Yoda's level, however I have no real proof until 'Path of Darkness' is released.
I always wondered about Hoth. Have you seen those arms?
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Have you seen how Grievous leaps great distances (in any direction) and how he crushed that Cerean's skull in Clone Wars? And he he defeated, what was it 4 5 jedi, and would have destroyed Ki-Adi-Mundi if the clone troopers hadn't arrived.
I believe Hoth is not on Yoda's level. I would he might be slightly lesser than Obi-Wan Kenobi in swordwork and maybe equal to or slightly lesser than him in the Force.
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