Yes, but Edmund changed. The seed wasn't snatched away. It was still there eating away at him and making him feel extraordinarily guilty. Perhaps the 4 Pevensie children are not meant to be viewed as 4 grounds, which might've been meant to represent those to whom the word had not yet come. Perhaps the Pevensies are supposed to represent the 4 stages of Christianity, or the 4 types of Christians there can be? I say that because in LWW when Mr. Beaver asks them if they are the sons of Adam and the daughters of Eve, Peter replies "We're some of them" possibly implying they had SOME kind of Christian upbringing. So maybe the older Pevensies were already Christians before coming to Narnia. For example perhaps Peter represents the Warrior Christian, the one who takes a stance against evil. Susan might be the Kind Christian, the one who wishes to help everyone. Someone who really practices "If your enemy is thirsty give him something to drink..." Lucy could be the young Christian, the one who loves Jesus so much that when she makes a mistake it tears her to peices, but she gets right back up again. Edmund of course is every Christian that has walked the face of this planet...the Repentant Christian. Lewis knows...I certainly don't.
Slainte!
Eruliel