Jackinthegreen
Explorer
Front-loaded doesn't necessarily mean over-powered. Fighter 2 for example. If the powers gained don't change the character's tier enough to overshadow others in the game, then it and the retraining should be allowed.
You're more right than you know.If "some" = Greenfield, then by all means, disallow it.
If "some" does not = Greenfield, then consider allowing it.
You know your player's intentions better than any of us.....
At 11th level he's planned to take Sublime Chord, and that really is the only time you can take that PRC. (You can't take it earlier because of prerequisites, and you can't take it later if you want to complete the progression, and you can't take a dip into another class along the way because the PRC has a class lock: Once in, never out until you finish).
For example, we have a Bard who has been adventuring in the Arabian desert. He's 10th level.
[...]
Now he discovers the SandShaper class from Sandstorm. He needs to retcon a Feat from 9th (Craft Staff), and his 10th level [spell].
That's a pretty big rewrite. But he's never had the time/money to craft any staves, and has only used one spell he gained at 10th, one time, and it didn't work.
So, do you allow it? I'm too close to this one to be an impartial judge fairly.