I’d add Erica and JenK too- they’re not very popular anymore, but both have excellent technique, very clean and powerful moves and can dance different styles.
But you can’t really fix memory problems! Any girl with memory problems will certainly benefit from extra assistance throughout the season and multiple TCs, but that would always be a struggle for them. Now, someone who is a “take home” learner, or not very clean/sharp or not powerful etc, yes they would benefit tremendously from extra training and support. Even with no extra help, VK (and Lily and Kristen) spend so much time in TC last year so she probably had time to learn all the dances, or at least the majority of them. When you spend months practicing the same moves over and over again, you will “come back stronger” no matter what. That’s why they normally expect the comeback girls to be almost at vet level.