If you only want to play the new Xtreme Legends content (Survival, New characters like Kojiro Sasaki, New stages), you do not need the base SW2 disc. Just run the XL ISO alone.

Samurai Warriors 2 Xtreme Legends Iso Portable -

If you only want to play the new Xtreme Legends content (Survival, New characters like Kojiro Sasaki, New stages), you do not need the base SW2 disc. Just run the XL ISO alone.