why is cavendish not the lead out man for the team sprint ?

i follow track but am relatively new to it and was wondering why someone with the accelaration of mark cavendish does not lead out chris hoy?
who wold be your lead out man? 0 votes
mark cavendish
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craig mclean
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jamie staff
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Pure track sprinting is more about explosive anaerobic power (0-60kph asap) which Cav would need to bulk himself up for which would do his road riding no good at all. Would be interesting to put Cav up against Hoy just to see what would happen, but I think Cav would be very much left for dead.
Not sure why he would have to bulk up, Ross Edgar is not that big?
Neither is Vicky !!
Would be interesting tosee what Cav's 200m time is on track, also the kilo, that would give a better idea if he could do it or not.
http://www.youtube.com/watch?v=aK5Bfqj5fxY