Hey

  returned as in the power. 

for example: lord of the ring: return of the king.

Aragon was a heir and he regained his throne. he never left the kingdom though.

g8: dragons say Golden dragon shall return. however, Adniel is a new born dragon.

he is referring to the status/power rather than a person.

therefore, tarlach record is refering to you.

so Lugh isnt Milletian.

just because they are from the other world doesnt mean they are milletian.

All Tuath Danan are from other world too.

so that proves dragon, glas, dougal isnt milltan.

and the detail about Tin used to be in NPC guide in mabi web. he even says, "is all Milletian like that...?" if you talk to him somehow.