I would like to second the above unanswered question, but also ask my own.
I was able to add this mod to my game installation along with the replaced x-voice and have successfully completed the game on Easy mode using Angel as my lead character almost all the time with Beast, Iceman and Cyclops as my helpers. I liked that they were given an Old School bonus due to being the original four X-Men, while Jean Grey is also allowed into this category. I want to thank the modders who created this content very much for making this possible and doing such good work.
I was curious though - is there a step by step process to re-add one of the characters that was deleted and replace one of the new characters back with them? I saw you removed Sunfire, but I wanted to keep him since even though he left the team early on in the comics, he was originally recruited as an X-Man and the game's original version categorizes him as one of them. I was thinking of removing Dark Phoenix since I usually prefer using the regular Jean Grey and don't need two kinds of her at once.
Was Sunfire's data overwritten by a custom character or is all I have to do is copy his herostat file from an unmodded copy of the herostat document, decompile herostat, paste his herostat back in and recompile herostat?