That's one main issue i noticed in almost all translation patch vs original Japanese version.
Like one for example, nothing as changed except some low rated players removed : WE10. In fact Cagliari was with all fake players not even ressembling.
He "sacrified" some players departure on July to complete Cagliari with real players. To be honest it was more playable.
I don't post for it but i discovered something really interesting about J-league 2008 while i was creating Bayern and Werder : it's almost the opposite system as PES 2008! haha... Here's the simple tutorial. But don't worry i will create Bayern and Werder instead of PES and WE United.
Just for info
@geeeeee and
@marqisspes6 : JL2008 is probably my main favourite game in part with WE2008 which i'm desperate to found an editor lol, don't worry i don't ask anything marquis, i'll do it manually. Differences there's NT, more complete, but less ML really game changing option and less mode. They also removed tons of Preset on JL2008, i trough i could've recreate perfectly Bayern but no

You can play against NT even on JL2008 BUT only with the Japan Challenge Mode, so with Japan vs very very unusual nations, which is interesting. Gameplay : tiny bit slower than PES 2008, but JL2008 is a the top of the top WE/PES to me.
A. You can unlock every players and Special Clubs. They (WTF) don't appears at all in ML

. Even if they registered to a club. Explanation:
Test 1: i searched about almost 5 unlocked players on their original section they're only here if you want to create some fantasy teams in fact

Test 2: Ribery, Toni, etc. were registred to PES UNITED and didn't appeared in ML neither, unlocked or brought in WE-Shop.
B. There was some issue i completely forgot about those PES/WE UTD players : their cost are really versatile and lower, a bit like the "PLAYER A001" on PES 6 and 2008. As Unlockable players didn't worked. So i trough there was an annoying problem... BUT :
1. Players from PES/WE UTD disappears from ML when they are registered under the "Legends Clubs".

2. And in the opposite now : i recreated Ribery over a player from the Legends club > He appears in ML if he's registered to PES/WE UTD, so you don't have the same issue as the WE-SHOP players as Legends clubs Players. So everything is almost perfect or should i say you can with some tricks have a very "clean" database
CONCLUSION / WHAT TO DO :
-Just for ML : you got to base copy the players from Legends clubs or create necessary player over them, then "replace" them with the PES/WE United players.
Then with the PES UTD players registered in, for example, Classic Bundesliga (classics are made by league) you can recreate identically the old players...
Or for example, one idea i really like but i don't think to do it : recreate the 2007-08 best players of the league season, even if they're duplicate they won't appears in ML