"We know that Maguuma Druids were Krytans who, after moving to Maguuma jungle, have lost their bodies and became some sort of "spirits". In recent interview, Ree has called several times the Pale Tree entity a "spirit", and also said that she (the Pale Tree) is separate from Norn Spirits of the Wild.
Maybe the Tree is connected to Druids, rather than Melandru itself. What if the seed has contained one of the Druid's spirits? What if it chose a humanoid form for Sylvari because it was once human some time ago?"