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Of course it makes sense, frames are designed around a certain fork A2C which determines listed Stack and then BB drop is how low below the centre line of the axles the BB sits, so if you have 2 identical frames geo wise, except one has a 20mm lower BB drop, then your saddle will be 20mmm lower than on the other, hence you will also not need to raise the bar as much, thereby making the effective Reach actually longer on the one with the lower BB.
"SHOREBOY = This makes no sense to me. BB Drop is measured to the rear dropouts, and would have no effect on stack or reach. It simply states how far below (or above if you have BB Rise) the BB is in relation to the rear dropout."
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