That's immediately what I thought of when it came up in the Podcast.
So, each person to take on the mantle of Tahu, Lewa, etc. communes with those who once had that spirit, who are known after death by their original name. So, Vakama became Tahu, was known as Tahu, but after he died is known as Vakama, the XXth Tahu or something.
So, sort of like Aang and Roku, current gen Tahu is primarily mentored by Vakama but can also talk to Lhikan, Duma, etc.
This could be interesting for Lewa if one of her previous incarnations was Nidhiki, who somewhat followed his G1 self's path and betrayed his team. Also, you could throw in a reference to Greg's original plan and have Matau also temporarily betray his team when he was Lewa, giving current-gen Lewa an internal struggle over whether there's something intrinsic about the Lewa spirit or the person Uxar chooses causing them to turn traitor.