Because of the countless discussion on "who has the better bracelt?" but it seems as though Shugo doesn't have to, because how much it would delay the anime.
You see, I have a problem with that too, y'see, I read all three of the Manga's and in those, Shugo does need to use the virus core, and Balmung gives it to him after a battle. But, the Anime goes on longer and has so many new episodes in it, that arent in the Manga, that I had to quit watching it because it got me lost, and it just wasnt any good anymore...They should've kept it a Manga...
Like Tsukasa, I cant Log Out...My fate rests with the yellow metal...and my own heart of stone...left to be re-stitched just so it can bleed again.
- E.G
in the manga he does use vires cores to hack gates but in the anime he dosent, they are basicly the same up untell the haunted house epasode when rana gets traped in the game the thing is after this point they are 2 compleatly different versons of the same seares
the only thing man knows is that man knows nothing
Most people agree that the manga's the canon story for Legend of the Twilight, so Shugo does need to use virus cores, they just removed it from the anime to save time. =/