Willingham is the only true shortstop out of these 4. I'm sure she will get a shot at short in the early season. She's a very good athlete with a big swing. I'm surprised that the Weekly's really did not recruit more at the SS position. The other 3 are more natural 3rd base, in fact, I've never seen McCrary play anything other than 3rd. (my kid is a freshman at UTC and played in the same TB circles with Fury Plat, Sparks Elite etc - she's played in the same district as KK McCrary and I've watched them play each other many, many times over the past 5 years).
Both of them will take some time to adjust to the faster pitching of the top fastpitch programs like UT will face, but once they do they both have a lot of upside. Milloy is probably already there and will be an all-american type in a short period of time.
I've also seen Fox and Hazelwood play TB. Fox will be a pinch runner type and I'm not sure that Hazelwood will get much pitching time this year, she may be a longer term development player.