it should, FPC 3.5.1b only fixing the music loading correctly when the Common files is replaced from the start! its the Modules inside Common2 file that loads both Fighter and Bx_fighter
and I guess it should work if you set up correctly since Common2/Sora_melee is loading stuff from the Module folder inside the ISO/WFST and now Common2 file also looking for the bx_fighter that calls for the all BrawlEx4 folder! the FPC code only calls "If this file exist on SD Card, Load that instead from the ISO". so my best guess is bx_fighter would also look inside ISO for those 4 folders if you added them or planing to have it on a SD Card
thanks for answering P:, but i have to add that I already figured it out myself, yes ,bx fighter loads inside an iso, I tryed the brawlex 1.1.2.1 build (for DVD-WBFS backups, ) , I puted all config files on the root of my backup, and the other files inside the files folder, and I got a crash xD,. then I did another Backup but without BX_Fighter, and everything worked, but Dantarion Alternate Stage Loader didnt, then I Builted another backup, but replacing BrawEx Common2 with the original, and everything worked, even the ASL code,..
my first guess is that common2 (not _en) and Bx_folder should be on the SD, and the config files should be on the root of brawl game backup, to make BrawlEx1.1.2.1 work.. I should try that later..
-- By the way. and as I said before, common2_en messes up ASL code, that file is the cause of why ASL code dont work with brawlEx...