The Question and Answer section for The Lightning Thief is a great resource to ask questions, find answers, and discuss the novel.
Poseidon tells Zeus that he admits his wrongdoing, and Percy feels as if he is just a mistake, and not actually Poseidon's son. Zeus imprisoned Kronos in the pit.
From the text:
I'm not sure when I first realized something was wrong. Probably, it was when I noticed the guy standing next to me at VR sharpshooters. He was about thirteen, I guess, but his clothes were weird. I thought he was some Elvis...
I think Percy would have been able to put up a much better fight. Percy had his own powers but he could not risk endangering the mortals.
