Felix is in decent, but not great, 100m position this year.
Currently, she would get crushed by the top 100m runners, who not only have good starts, but good speed maintenance over 100m...eg. VCB
Felix is svelte, she runs like a 400 runner, not like a short sprinter. In this vid:
http://www.youtube.com/watch?v=w6aOD901_gA&feature=related
you can see how she quite literally stands up out of the blocks, to a vertical position, then starts running. There is no drive phase whatsoever, which is remarkable.
I think that she's got enough power to HAVE a drive phase--maybe not a great one, but one that could easily save .15-.25 IMHO. There are SO many things wrong with that start, that there is nothing right. Improvement could be achieved by changing almost anything--assuming that she has the ability, and assuming that she is coachable.
You can tell she's uncomfortable in anything but a completely upright running posture. Even at speed, I think her arm action is off. Her turnover in "transition", to the extent that she has one, is nowhere near where it needs to be.
Her turnover at top speed is less than the best, but her amazing stride, with that beautiful recovery, makes up for it--but at that, her top speed is only as good as, and likely a bit worse than, the best 100m sprinters--she will sustain well, but she won't peak as high.
IF she gets a start, I could actually see her reeling in the better-starting, weaker finishing sprinters, because she doesn't seem to panic or grip too much (although she does, a bit).
Check out Tianna Madison, though--she's pulling away from VCB after 45m.
Uhhh...