You're right, and I'm not going to complain about Contreras being 2 instead of 3, but I don't understand why Frelick is sitting at 4 instead of 3 when he's a) better than Santana, and b) you could have L-R-L-R if he were at 3.
Probably the answer is he's a rookie and Counsell wants a veteran at 3? At least that's the reasoning I can come up with.