Maybe he lost power when he got absorbed.
Maybe its true what Ron said:
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Ronhell
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as far as i understood gohan's power its simply that his max unreleased power is so uber that he dont even need to go ssj to beat buu.
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It doesn't really matter maybe they will explained in the movie and indeed it was never stated that he couldn't go ssj after his training with old kaioshin.
Or maybe the cover is bad like someone mentioned in his post
This is a picture from the official website.
All that above or Akira forgot about it
But i highly doubt that or at least i hope he didn't because that would be lame....a lot.