If you were to say that Molly and Kyla are not as athletically gifted as most D1 basketball players (at least for teams in the Top 50 or so), that would be a true statement. That would also have been a true statement with respect to Mel Thomas, Pam Webber, the post-injury edition of Caroline Doty, Maria Conlon, Morgan and Ashley Valley, and a number of other players who have contributed significantly to UConn basketball over the years. It might even be true of Jenn Rizzotti.
I think either Kyla or Molly could (if necessary) fill the same role as any of those players, possibly excepting Rizzotti. It is possible to have a significant role on a WCBB team without being an amazing athlete, even at UConn's level.
In Molly's case (not Kyla's), it is not limitations on her athletic ability that are holding her back, but rather mental issues with taking open shots and seeing the court. I would compare her to Nicole Wolff in that respect --both honor students from Eastern Massachusetts who could have gone to more academically prestigious schools, but chose to come to UConn for the basketball experience. They both worked really hard, and they both worried too much about making a mistake.