okay i found the source of the problem here, OP is right, when regular earth shaker is blocked, both hits overhead and low, its completely safe on block, and has massive push back, its only -1 on block. BUT when used against aquamans trait, when you just block low, and not the overhead, the overhead hits but the low is blocked, but here is the thing it doesn't give him the push back, nor does it retain the properties if both were blocked. you can test this yourself by recording DD walking up on you and doing an earth shaker, block it normally with AM and try to punish with b1, now just block the earth shaker by preemptively traiting up and hold down, now try to b1, it works. so not only does doomsday not get a mix up because MB ES is also low, but now he can just block low and avoid any mix up and full combo punish him for it. but it doesn't mean its a 10 - 0 MU imo, just don't do ES and if you have to, do MB ES or only do it when he doesn't have trait.