You're where right, Allen used the arc.
He used the arc. Remember the thing he stope from the earl and used it for the exorcist for awhile. Wen he went on the run he said he wouldn’t use it anymore since the order has access to it too
Anyways decent chapter, even though the progression is so slow. I am kinda glad that Allen finally vented out all his frustrations to Kanda.
It was a good point about Allen treating the secret of the Apocryphos delicately. It would be a major blow to the Order if they found about it and Allen is a sensitive guy. Plus, if the Heart and innocent are unacceptable as their core, then both Allen and Kanda need something new to fight for.
It would be good if they could both do something productive like takedown Apocryphos, find the Heart of confront the Order. Or maybe they could both try to rescue Lavi and Bookman.