User blog comment:Real Godisme/Chapter 481/@comment-4933386-20160412073149/@comment-7418318-20160412085114

Just take Azuma as an example.

In life he was looking for the strongest oppoents, always looking for someone to have a real challenge. And that's exactly what he got from Erza. She was his ultimate challenge, so strong that he couldn't defeat her (actually couldn't defeat her and the others together... but that's beside the point here).

In the end he died mostly happy and satisfied, with no hard feelings toward Erza, since he got exactly what he was looking for. He has no unfinished business.

Sure he might enjoy a re-match, but that's more like "This was fun, let's do it again" for him rather than completing unfinished business.