Thats like saying why can't defenders stop Messi he does the same drop of the shoulder/body feint all the time, for the good players its not if they do it, its WHEN they do it.
Even if they are fully aware the fact that you'd have to divert manpower to look out for a lurker when 4 others are planting and taking site is a loss for defenders and if the gamble fails where mako doesn't lurk its like time lost waiting for nothing.