Forum:A couple of questions =)

Hi all ;D I need some expert's advice on a few ruling questions:

a) Is it true that contact fusion (for example, gladiator beast's) can be done with face down monsters? o.o

b) The special summon of a monster that says "cannot be special summoned except by having X dark monsters..." (for example, the dark creator and dark armed dragon) can be negated with divine wrath or war chariot?

c) If i special summon chaos sorcerer and/or the dark creator, and they get sent to the graveyard, can i special summon them by monster reborn, for example? O.o

Thanks ;D