Can a certain South African not make decisions on size. If a player is taller and a more explosive runner it doesn't make him a better jumper smaller ones are generally lighter. For example Kevin McLaughlin is 6 4 yet a better jumper than many second rows.
Also saying Burger isn't that good a carrier because he's not as big is ridiculous. He is 6 4 and 110 kilos which is big enough. Sean O'Brien who is generally considered one of the best ball carriers in the world is 6 2 and 108 kilos.
Stop obsessing over size.