I ask this because I would like some closure, while at the same time the series needs to just stop.
First things first, when you have a DBZ styled fighting system, kendo can't be your trump card. It just doesn't work. When someone has lived for centuries on end and is uber powerful, they should be able to fight well. They won't consciously decide to fight better when they consciously realize that they are losing the battle. Instead they will subconsciously realize they are loosing and subconsciously take things up a notch.
When I see a shark in the water, I don't think "Oh my, I better release some adrenaline and start swimming." My body will do all of this automatically.
Second, when you have a DBZ styled fighting system, people who have taken centuries to aquire their power shouldn't be able to double it in less than a month without a serious explanation. You can't just say "training". Someone has to unlock a new powers, learn a new move, or enter some "intense" training that would only be considered in desperate situations.
Third, reusing the "save the damsel" plot is an epic creativity failure. Another overly used theme is the one where Ichigo goes hallow whenever he's in trouble. I think this was abused enough to become a running gag. Screw the 'wide eyes' BS, just put a freakin' hallow mask on his head whenever he feels outmatched.