that makes sense I thought you were suggesting to raise the drops far enough so as to make the position comfortable for normal riding since that is where a track bike is meant to be ridden. Anyway the difference in headtube height will be obliviated by different stems and bars. Even if that wasn't the case fitting systems are only accurate to within a couple of centimeters(if that). If he is buying a frame based purely on that I don't think going 1cm below the reccommended size is a big deal. Ideally he should try out various bikes and figure out what he likes but I guess thats not an option.