Reminds me of an exercise physiology lecture I once attended, the well respected doctor of exercise physiology claimed that given a muscle biopsy, a VO2 max test, a power test and some limb measurements, he could predict within a few seconds how fast an athelete could run over a certain distance.
My response was, give me a stop watch and a running track and I will tell you EXACTLY how fast an athelete can run any distance!
Thankfully it seems that Francis can see past the stats from draft camp and we end up with players like Daniel Conners on our list.
On the other hand, I'm not so sure you should use stats simply to confirm what you already see, that would be pointless and stats have far more value than that. If we had paid more attention to draft camp stats then surely Danyle Pearce from Port would have been taken as a rookie pick. Perhaps we have learned from that in taking Gourdis last year.
Phantom uses a height chart to put together a structure of a team list, which is a good place to start, however as pointed out some players play taller or shorter than their height. So like all stats you need to keep an open mind in your interpretation. Michael Phelps is a good example, he is around 6'4 inches in height (193cm) and yet his arm span is 6'7 inches (just over 200cm!). More a ruckman in reach than a true KPI.
A good stats man will know how the stats are collected and therefore where problems in interpretation may occur.