From my perspective.
You have Cross busting through a magical barrier from outside the arc in what I'm guessing is another dimension. If he can do that I'm sure he can grab Kanda and Crowley. If not, it looks like everything was being sucked into a hole. So they may just wind up on the new arc.
As for Tiki. It seems it wasn't a good idea to remove noah from him. Despite being evil. It was obviously keeping him human.
If Allen is general level now. I wonder what the sword would do to an Akuma? Any of his weapons can destroy an Akuma. Maybe release the soul and leave the akuma as independent?
Just some thoughts and 2 cents.