I doubt the epi will negate the ap that much
and to answer question two, this is the same thin as asking why
people run both insulin and anabolics. they work throuh differnt pathways
think of it like this
your body is a bucket full of water with small holes in it, that are constantly leakin water
each hole represents a differnt pathway(pituatary/gonadal/thyroid) each path way(hole) you patch up prevents a possible loss of gains
the big pros basically take a different drug to replace each natural pathway. if you saw what they probably take youd get sick just lookin at the list