i did the same for Tom, since I know that you would not want to return without him, Ginny. and other people are doing the same for all the other... bodies.
as of now, i have not been able to conclude without a doubt the reasoning for your extended stay in limbo/ the reason the universe refuses to allow you back to life. Colin, i suspect it may have something to do with Vincent- we always figured there was some reason he chose NOW to return, and i think this is it. however, for Ginny and Tom, i just don't know the reason. the only thing i could come up with is that it could be due to the complications of your inter-dimensional relationship, i suppose, but i can't really fathom why that would affect both of you, and not just tom, who did the universe-hopping. so that doesn't really make sense after all. i'm sorry. i will keep thinking on it.
but don't worry, i will get this figured out! we've got a lot of people working on it, we'll have the answers soon.