I still think he will be something different. Not a "Radiant", and not a "non Radiant". He is kind, but he is a soldier. He loves his sword, he loves his guards, he loves his storming wardrobe!
But we fail to see that we won't have the same 10 orders-order we had before. This is a new era for Radiants, the examples are off course Venli and Renarin.
So, Adolin will have something with Maya. A new kind of bond? A differnt sort of Nahel bond? A non-power Radiant? The only one who knows is Brandon.
I also think Adolin must be special if he somehow attracts the heat of passionate arguments. It can be his relationship with Shallan, or his no-bond with Maya, his flatness or deepness. He takes out the most fierce deffenders and attackers. That speaks well of his character, isn't it?