User blog comment:PlaguedWings/Demon's Souls 2: a fun little thought/@comment-6003396-20140115103409/@comment-6003396-20140116100002

I see what you mean, but I believe The Moonlight Greatsword and a character named Patches were also in other series of From games, King's Field and Armored Core. So things like that are not enough to suggest that the worlds are linked, otherwise it could be argued that they are all part of one big world, which would not make sense at least in the case of Armored Core as it's a mech game (armored mechanical suits).