I've heard nothing at all about CLAMP's involvement with the show apart from writing a few scripts here and there (and they had nothing to do with Fujimoto), so i'm just going to go with the fact that it's anime original, though i don't see why it would be approved. Still it's good to see some exposure regarding his past, because there's none in the manga, like you said.
Glad you've found a decent picture to use then, and fingers crossed that it'll turn out usable in the end.
With the manga having answered so little (from what I understand), I think they (Clamp?? Madhouse??) decided that they needed to be a bit more aggressive in their story-telling if they wanted to have a more definitive story by the end of the series. Doing this has its bad points and its good points. Bad because it drifts away from the manga. Good because sometimes -- like with Fujimoto -- it drifts into areas not yet covered by the manga that fans might want to know about. What I wonder is how much of Fujimoto's back story is approved by Clamp?
By the way, I think I have found a source pic of Shinra that I might can make an avatar from. First, I'll have to scan it in. Then, I need to see if I can turn it into a decent avy. So it's not a done deal yet that I'll use the pic.