Yesterday evening Kaigan say that who doesn't sign up in raid planner, but play the raid, will take the dkp points but not the items, i agree.
But i've a question about that.
If i sign up one of my alts on the main character, for example
"I signed up my TOS on the place reserved of Sin i'll take the item for that?"(for the char that i use in effect in the raid)
I don't know if there are a rules about that, but i think that, only the signed char will take the item not the other char.

so sorry for my english xD

ı think ı got your point
yes signed char will take the item and unsigned wont
so everyone need to be clear about what they want
but
if wee need 1 of your class to maintain the raid
you can also take item to that class