Forum:Evil Hero Dark Gaia and original ATK problem!!!

For example.....the original ATK of Dark Gaia is about 4000 after fusion.....so if this Dark Gaia is sent to Graveyard and then I SSummon it by Calling of the Haunted...thus its ATK is still 4000????

MOreover, in a another case, when I Dark Fusion 1 Grinder Golem (6000ATK because of Megamorph) with 1 Raviel, Lord of Phantasms (4000ATK) ====> so the ATK 10k is possible????