Brawn is not just pure strength, it is also resilience and athleticism both of which he has in spades. I would go with 4 for Anakin who maybe bumps it to 5 by the end of the Clone Wars (he's certainly used it enough by then).
I would also put a point or two into Cunning. Anakin in the Clone Wars showed a knack for out-of-the-box thinking and approaching a problem sideways. Even Vader keeps this up with his hunting down of Luke and other (like the characters in Rebels).
Difference between Strenght and Volume XD
Vader, even Anakin is REALLY strong. About "supercharged Vader" even the sample on the first pages from core books stats that Vader, Yoda and co, could have stats of 6 even higher (pg 28? not sure), and... I'm aware is fear but... watch Rebels and ask Kanan, Ezra, Sabine and the rest of the Rebel fleet if its propaganda or not XDD Also Read the comics... Vader is just awesome! XD
So, no communist or imperialist propaganda here XD
Bruce Lee is ripped to be sure, but he's not a musclebound beast like Ah-Nold or Brock Lesnar. Still he could easily destroy a man with his strength (and skill). I might put him a 5 (MAAAAAAAYbe 6 with the cyber stuff), but 4 seems more on the money.
And yes, I would start him as an EotE character and one of the two generic force trees before moving onto F&D. Abosultly.
Hey guys...it's as if you read my mind!
Care to test your builds against each other in a friendly contest?
Go here and post your Anakins for YBtC #8!