pi4t: Er...no? When I started Kingmaker with a brand new character, the game automatically levelled him to level 10.
Hickory: Kingmaker is designed for a level 1 player. Once the prelude is over, you'll find your character returns to level 1. If you complete as much of it as possible, you should get to around level 9. Since WCoC is designed for a level 6-7 character, your preferred play order should be Kingmaker >> WCoC, rather than the order you stated in your OP.
Seriously? I've been playing several other modules first so I could rp getting those levels! Well, that was a waste of time...
(Yes, I do know you can use automatic levellers, but I wanted to do it through gameplay).
I guess I'll abandon that character for now, and move on to Tales of Arterra.