In his mind, there was no chance that Dyon was a match for him now, yet his first action wasn't to seek him out despite the fact he could have, his first action was to go to the Pakals.
No matter what, Chenglei knew that if Dyon wanted him dead, he would be dead by now. It was Dyon who allowed Chenglei and his Daiyu Clan to go. No matter what, this was a debt his pride as a Dragon wouldn't allow him to forget.
Chenglei had come to the Pakals because he had plans to take their territory for himself, to rule over them and become the man he was meant to be. If he didn't bow his head to Dyon, why would he go to the Pakals just to do exactly that?
In addition, Chenglei was born with all of the Daiyu Clan's expectations thrust upon his shoulders. All of his actions to now had been for the sake of his Clan. If this wasn't the case, Dyon would have never let him go.