Jennifer could have been an elite professional/competitive dancer in her prime, no question about it. What a tragedy her accident was, but then, shit like that does happen to some people with huge potential and their lives are forever altered.
Bristol started with two left feet, no athleticism at all, but she has come a LONG way. Another five or six weeks at this rate of improvement (but with more intensity/effort) and she could be an entry-level competitive dancer (with emphasis on entry-level). She still has problems emoting with her facial expressions. I like her, but she should have been gone two or three weeks ago.