Here's a little story about the team..
Zeno was the sole creator of DE1 to my knowledge, apart from any third party scripts he may have used (KGC Active count battle, among others). He's 100% responsible for the story, events, and maps. Amazing, really, I still have trouble believing it. Oh yeah, he did any and all sprite edits and custom graphics you saw, to my knowledge. A bit after he released version 2.0, which was a big overhaul, I messaged him almost daily with more bug fixes. Eventually, we got around to talking on AIM about DE2 and all of the cool systems that he wanted to script but just couldn't envision working out. By far the coolest thing he mentioned was the idea for a new way for characters to learn magic.
I had coded a similar, but less in depth version of what he wanted for one of my own discontinued projects, so I offered to take a whack at it. He sort of chuckled and let me have a go, and the system was more or less working flawlessly within two weeks. That's pretty much when I became the scripter for the project, and I've done a number of other custom systems already, though I'm not yet finished. We keep cooking up great ideas. On another note, we have a fantastic musician who's helping us with a custom soundtrack. It may or may not be 100% custom, I'm not sure, but you'll definitely hear some original sounds in DE2.
Hope that answers anyones questions! The team for DE2 is only about three people, and Zeno had no formal help with DE1.