I admit that I am guessing at this as it is all new to me. But if what you surmise is true then 'self-centred' would certainly point to an 'evil-aligned' group or individual. Obviously KAOS is supposedly an 'evil' group and would be the prime suspects.
What I was trying to attempt to state was that anyone that is 'good-aligned' would only do such an act if they considered the egg a threat to Nevron if left in the hands of Drago. Therefore they would decide to use it for the benefit of Nevron either as a 'pawn against Drago' or reared by the group with the tenets of 'goodness' ringing in its ears.
I admit that does not count out any neutral agencies or even individuals. The list could be endless.
If this is a direct attack on Drago, then who are his known enemies? Who would have the most to gain from such a kidnapping and potential subversion? Is the list so big that we will never know?