The Wings seriously lack defensive discipline and skills at their "core". It looks many times like playground ball with opposing players haphazardly defended and many times able to make it to the basket unguarded due miscommunication or worse no communication. Agree about Carrington. Carrington supposedly prides her defense but watching her performance in the last several games those skills seem applied irregularly. Sometimes good; most times not. Not a keeper IMO.
As for Siegrist, when she's on she can be a good 3-pt shooter and especially with Paige able to spot and feed her when she's open, I think worth retaining.
Wings have many problems to be solved besides just Carington and Siegrist, however. They really need to scrap whatever it is they thought they needed, go back to the drawing board having some very pointed, uncomfortable discussions and start over with Paige as the building block.