I agree. Achilles is constantly described as “The swift footed”. From this, and the typical physique of the Greek warrior statues of that time, I take it that quick, violent attacks were favored. This requires a lithe frame with the over-developed glutes and hamstrings of a sprinter, which is exactly what the statues show us. Moreover, if you look at the surviving examples of Greek armor and helmets from the time, you’ll see that men were much smaller. Thus, it may be that the man-killing Achilles of 1300 BC was no taller than today’s fifth-grader.