User blog comment:Raging Blast/New reviaws from Raging Blast!/@comment-3122168-20110122203722/@comment-3122168-20110123224142

Gohan stopped training, thus decreasing his power level and getting him out of Mystic.

And yeah, a physical sword and a Ki one can raise one's power level. Saying that a Ki one cannot is like saying that the Kamehameha doesn't raise power level.