we know that vader is 80% as powerful as the emperor but they(yoda obi0wan) don't.
anyways this is off the subjuect TFU shaak ti would wim.
compare all of her feats to ROTJ lukes feats and it comes down to she would destroy him in sabers.
(and on a side note something that bugs me about ESB and ROTJ is obi-wan and yoda believe that if luke fails leia still has a shot but how much training could they put her through when they are both dead/ghosts?)
I don't think Yoda foresaw his death in one year's time, otherwise they'd be scrambling. That or they themselves had stopped caring.
__________________ Recently Produced and Distributed Young but High-Ranking Political Figure of Royal Ancestry within the Modern American Town Affectionately Referred To as Bel-Air.
do you really think that yoda went from being able to go toe to toe with the most powerful sith lord to keeping himself alive with the force in 20ish years?
Yeah. Turning nine hundred would do that to you. And Mace notes in Shadow Hunter that he had seen Yoda slow down during his (Mace's) lifetime of forty years.
don't get me wrong he slowed down in the last 20 years(from ROTS to ROTJ) but so much to the point that he was keeping himself alive with the force? no way.