Originally posted by Ziggystardust
where?
The Publisher's Summary of Legacy of the Force: Betrayal have Luke dreaming of Jacen as a being he likened to Darth Vader in power and ruthlessness. Then publisher summaries for some of the other sources(like Tempest, Exile, Fury) note Jacen's growing more powerful by the day. And the series of novels takes place over the course of a year and a half.
Anakin Skywalker, someone who's potential is passed down to Jacen, in less time has grown by a "vast" amount, so it's not hard to see Jacen doing the same.
Originally posted by Ziggystardust
Most characters don't have any clear limits in regards to their power of the Force. Does that mean a featless Jedi could rival Galen marek's telekinesis, because the latter has established his limits while the former doesn't? According to the blurb, Caedus has a greater command of the Force than his Grandad, but there is no clear distinction between how much greater he is, in which case we differ to their body of feats and accolades. All this tells me is you have no reason to believe Caedus superior to his grandfather "by a decent degree" other than gut feeling.
Well, if you're going to play with strawmen. Holistically speaking, it's obvious a random padawan isn't above Galen Marek. What I mean is we know Caedus should stand tall ahead of Vader, but it's unclear to what degree. Comparing and contrasting feats it would seem Vader is superior, but with the fact that most ,if not all, of Jacen's feats by the time he's Caedus are done with barely any effort -- and a quote championing him as Vader's better exists -- there's no reason to assume the "hur dur, featz only!" approach would apply in this situation.
Once we get past that, Caedus is just better as per canon(if you wish to take Publisher Summaries as such).
And if you wanna play feats only, Caedus performed better against a pissed off GM Luke than Vader did against a pissed off RotJ Luke(I believe Beware the Power of the Dark Side even has Luke moving faster than Vader's perception or something along those lines).