Can't help thinking there's an element of flawed thinking here. While there is clearly an optimum sort of height level (6' 3"/ 6' 4") you would ideally like to be looking at for any keeper, is there not a counter argument to be put forward against those possessed of - for want of a better description - particularly significant height stats, in that I strongly suspect there is a corresponding reduction in their all-round level of mobility? I mean, you talk of such peronnel making 'a massive difference', but why, then, do we not see far greater numbers of such characters turning out on matchday?