Noah (or Lutz if you want) who fought Lassic and Dark Force 2000 years did die
I agree with you, but I believe Lutz is still alive in PSII (AW1284). Now that I think a little more about it, I have the impression that it's mistranslation, because everyone there is talking about Lutz and suddenly this person says "the glorious man is buried here".
Probably "buried" was not the most appropriate word to describe cryogenic sleeping (since Lutz only died at AW1299). I'm almost sure if they retranslated this word they would not used "buried" which by definition is "the act of placing a person or object into the ground". In any case I don't see an alternative word for this since "space burial" have no ground to dig too and is similar this Lutz situation.
About the old-man:
It wouldn't be a reference to Myau in my eyes, whether Myau is the Old Man or not, since Myau will be considered a cat and not called a man. To go a bit off topic, recently I have started to think that the Old Man is a descendant of Myau, since he says that the Silver Tusk has been handed down for generations. If he really had been Myau, it wouldn't have been handed down to him from generations since it was acquired for him by Alis in PSI.
Yes, only cats threat Myau (or not) by Man, I don't think humans would call him by that. If he really is Myau is being discussed in: http://www.psalgo.com/bb/myau-or-not-vt ... torder=asc
I use "Phantasy Star: Sealed Memories as a shield", since that was done 1 year after the releasing of PSIV. I think they may have corrected some questionable aspects like "the generation after generation" thing. In PSdrama says that a blue haired man trusted "nei claw" to a family after AW1284 and would come back to retrieve it. The thruth is that he never came until AW2281 and since that time this special weapon "as been handed down for generations" like Roy said. The last person to carry that nei claw was Nei3rd, but she went to SEED's dome and died before Rika was born. How did nei claw reach Myau in Dezolis only Rune can tell...
I think espers are related to "newman project" (because of the symbols both carrys). In my opinion Lutz gave that weapon to Roy's ancestors because apparently their village is the nearest one to Nei's Silver Dome. But there’s one thing I'm certain: if the blue haired man was Lutz and said he would get nei claw back I think he is a man of word and would do it as promised... and before the ultimate battle against PD.
Now about Odin: In AW 1268 we (an agent) found in Dezolis a lost (laconian) Axe near a (wild) Dezoris Cat (A starving musk cat?) which seems to be guarding it. This is certainly a reference to Odin although no one can be sure if it is his axe. Eventually this agent returns to Motabia with Lila's gem and musk cat's axe 16 years before the great collapse (and we don't know what happened to him, nor the objects).