With regards to discard costs, didn't some of the early leaks confirm we were getting
Energy Recycle System in
XY: Ancient Origins? If we are, then there is a good chance that running a single copy of it and a single copy of
Sacred Ash should allow nearly
all basic Energy and Pokémon cards to function more readily as discard fodder. This has been a common tactic since the original
Team Rocket expansion, so while it is hardly guaranteed, historically its got a precedent.
For filling the Bench, I love it when people drop
Exeggcute because I'm often running
Landorus-EX. With
Absol (ROS) as a possible "replacement" for decks that currently enjoy a solid Active/Bench split hit, I'm not sure how well
Exeggcute functions in this role. Of course, I just stated I'm
clearly biased, so if I've got it wrong, not a surprise. XD
Hoopa-EX may simply become a regular part of
Shaymin-EX engines; while it won't combo with
Winona it may become a pseudo-
Winona that works with non-Colorless Pokémon-EX. Well, something to that effect: that is a loose description.