Who do you think will kill these remaining baddies?

Messanna
Moridin
Cyndane
Moghedien
Demandred
Aran'gar

Here are a couple more bad guys to throw in for fun:
Taim
Shadar Haran
Gholam
Slayer
Padan Fain

Here are my best guesses:

Messanna- Egwene seems to have made it her personal mission to find Messaana. Egwene is definitely undermatched, but if she can somehow shift the fight to Tel'aran'rhiod then Egwene might have a chance in solo combat. Otherwise Egwene could always use a circle or an angreal.

Moridin- It seems that Rand is destined to have a final duel with Moridin. The bodyswap theory is a possibility, but it would be kind of weird if Rand suddenly has a new body. We will see.

Cyndane- Anybody could kill Cyndane but right now I will put my money on either Moiraine, Elayne, or Aviendha. We all know that Cyndane is going to strike out at Elayne or Aviendha at some point just liked Moghedien tried to kill Nynaeve. Cyndane also has unfinished business with Moiraine-- but we still don't know if Moiraine will even escape the Tower of Ghenjei or still be able to channel.

Moghedien- Could it really be anyone other than Nynaeve?

Demandred- I have no idea about Demandred. I would love to see the showdown with Rand, but I'm still not convinced it would occur that way. This is the one that I am most perplexed about, especially since we know so little about the big D.

Aran'gar- In my mind it seems pretty obvious that Narishma will be the one that kills Aran'gar. Narishma is obviously going to kill a Forsaken soon now that he learned balefire from Rand. Narishma has previous history with Aran'gar so this seems to be the most obvious choice.

Taim- We have all been predicting Logain for years now. Logain is the obvious choice, but Sanderson will still have to find a way to surprise us in the process.

Shadar Haran- The best thought that springs to my mind is Padan Fain. What better way would Fain be able to get his revenge on the DO than to kill Shadar Haran.

Gholam-- My personal theory is that the gholam has been tracking Mat and company to Caemlyn. Mat is going to leave his foxhead with Elayne for her to study. Setalle Anan will be there for advice and along with a Kin member will help Elayne to duplicate the foxhead. They will create a arrow for Birgitte who will kill the gholam.

Slayer-- It seems that Perrin may be the one that kills Slayer. However, I wouldn't be too surprised if Lan ends up to be the one to finish the job. We shall see.

Padan Fain-- Like I said, I would love to see a showdown between Fain and Shadar Haran. Maybe they will end up wiping each other out.