As Walker and midnight wandered off, Walker was not at all surprised that a different class was given for a different connection to a spirit tree. The wind spirit tree was more related to faith in the wind and the knowledge of how to pass that down. Allowing for there to be an understanding. The dark spirit tree was growing in a way that it protected the ability of those with dark affinity. It allowed them growth so having a paladin that also protected it and the things it does is very telling.
This didn't mean he would not want to see what the other spirit trees managed to do in terms of connections. They were all developing spirits that would one day be the voices and ethereal bodies of themselves. It was just due to the high mana and the attention they received. Their deep connection to the people of Genesis and the growth of Genesis ensured it.
