Namco X Capcom OST - Battle [Xenosaga Episode I] (Extended) 

you're not the only one i would love the xenosaga games to get hd re-mastering...especially since I am from the uk and we only got one game of the xenosaga trilogy...and it was the second for some mind-numbing reason

I think that's because of the particular points in the story of Xenosaga where she and KOS-MOS where during the crossovers. **POTENTIAL SPOILER ALERT** During Endless Frontier, it's implied KOS-MOS traveled with Haken & Co. after she'd been repaired from the first T-ELOS fight but before the encounter with Voyager. At that time, Shion and the others were investigating Old Miltia and didn't have time for interdimensional travel. With Project X Zone, it was pretty much the same story, though at a different point in Xenosaga III, and in Xenoblade II, the KOS-MOS of that world is only a copy of the original apparently built by Shion and Allen at some point. Kudos to the Xeno team for going the extra mile to try and keep the overall Xeno continuity consistent.