Thats actually a good point but it also has cons.
Yoda didn't really have any experience with any big fights till around the Fall of Dooku and the Clone Wars.
Jacen has experience with some of the most powerful beings of all time and THE most powerful being of all time.
I don't think this thing works in SW. I just can give you an example of Banite Sith. Specifically Sidious and Plaguies. These guys hadn't fight with Grandmasters, wasn't involved in any galactic wars, most of their lifetime they were doing politic work for Revenge of the Sith and training. I mean you don't have to fight with Supreme beings to become top. You just need to have a gigantic force potential and do training. At least how it works in SW universe.