All right, I've put back his name as "main handle".
He's a completely new author to me, so I'm not used to his common nick

Regarding the co-compositions, I took great care reading all the NFO that came with each and every song. Each time George Fisichev is mentioned, it is as composer, and each time, Darth Nefelim is the "tracker".
So, unless the above is wrong, and Mr. Fisichev did indeed open a tracker, then , by all means, I'll complete the credits. Otherwise, it'll stay as it is. I mean, we just can't store "original authors/composers", or I'll end up adding Mozart and Chopin somewhere down the line

. What is done, in this case, is to paste the NFO as comment for the musics, which I did. Although, it's not available to public just yet

.
Anyway, thanks for you great feedback !
Sylvain