No idea to be honest. I have wondered how you can be the same height/weight and sprint faster and lift more weight (in essentially every compound lift), but not jump higher. Never really measured arm length or checked technique for us, which may be issues, but I doubt that much of an issue. Actually kind of curious what other people think. I have seen this with others as well, so who knows. I am just saying I have seen plenty of guys able to jump very very well despite not being extremely fast or strong and there are some guys running sub 10.4 and lifting decent weights (nothing crazy) that have verts in the mid 20s (ask mort about a certain MUC runner).
does muc = mount union?