Quoted from Wickerman2:I'll go with that...they were setting him up with his hopeful dialogue earlier in the episode. Then they leave Sasha alone though and she's already had her breakdown story so maybe she tries to intervene and gets off'd as well. Double bonus kill.
I also think it's Abraham. He seems to have finally found hope and wants to start a family, so he would get more sympathy from the viewers. He's kind of a main character for them to make a big deal out of it.
It could also be Glenn for reasons stated earlier, but that seems too obvious. Plus they already killed him once.
Michonne- maybe, she was starting to get close to Rick so this would be another tragedy towards Rick and she is a pretty big main character to live up to the hype.
It can't be Daryl because his hair was over his face when they showed him, but there was no hair in the camera view Plus I think Daryl is too big to die right now.
Not Carl or Rick because of what Negan said before he started the kill.
Not Maggie because she is pregnant and the director slipped and said we get to see what happens with her condition.
Eugine and the others- maybe but not a strong enough characters to warrant this much attention.