/sci/ - Science & Math

I'd like to know why the intermediate of pyrrole acting as a nucleophile at the 2-position is lower in energy than the intermediate of reaction at the 3-position.
The only explanation I've seen is that the 2-position intermediate isn't cross-conjugated, but I thought cross-conjugation was a different phenomenon to what is seen in the less stable intermediate.
E is a non-specific electrophile in the picture.