I thought everyone went after her because she has an innocence. Plus she is weak right not, it make sense for everyone to go after her (not in any romantic way).
But it does make sense for her to have the heart, since weapon type innocence is not suppose to save the exorcist (unlike Allen, but he in special for being the main character, so that's another thing too).
I agree with DE about Rinali having some hidden-healing power... though I am sort of scared for what she might end up doing. If she ended up sacrificing for all the others and dead, I will drop this manga immediately (...though I am sure the yaoi-fandom will be rejoiced).
If Miranda can sense the "time" left for both Kanda and Crowley, is she also physically connected to the ark??
Mel. Just some fanart artist who wanders around.