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That was Anakin Skywalker. Jacen flow-walks back in time, hears Anakin tell that to the Council, states that Anakin was telling the truth, and then muses that he's in the same situation as Anakin except that he's inferior to Luke.
So it's really just Jacen, not the narrator, musing he's better than Durron.
Jacen watched for a few moments and both pitied and understood Anakin, and knew that he wasn't following his path, not at all. Poor Grandfather: gifted, exceptional, dismissed, barely tolerated, largely untrained, abandoned. No wonder he resorted to crazed, desperate violence. Had he received the training that Jacen had, if he had been able to perfect his powers and experience all uses of the Force-even those the Jedi academy shied away from teaching-then the galaxy might have been a very different place.
I'm the second chance.
The Jedi Council dropped the ball. And they paid for it.
Jacen had accepted his Sith destiny, but now he understood not only that it had to happen, but why. Everything in his life had led to this point because Anakin Skywalker's destiny had been subverted and warped by well-meaning but blind Masters, sending him off on a tangent to do a flawed Palpatine's bidding instead of realizing his own full power.
I'm more powerful than any of you.
It was a boy's expression of anger, but it was true. And, as history repeated itself because it had no other choice, Jacen was more powerful than any of them except Luke. And he was growing closer to Luke's strength by the day.
When he achieved Sith Mastery, he would surpass him. He hadn't yet thought how Luke and he would coexist after that point had been reached. For a brief and tempting moment Jacen considered Force-walking into the future, as he had done before, but his instinct said to leave it alone for the time being.
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It's blatantly Jacen's perspective since it states Jacen would surpass Luke when he becomes a Sith. 👆
Note that Legacy of the Force doesn't provide omniscient narrators. It's actually rare for a SW book to.