What do you mean unresolved? Most of it has been resolved, albeit not in an extensive narrative. Anyway, there is supplementary reading available for the series by the author. Do check "World Guide - The Adventurer's Bible" which delves deeper about the world, races, characters, and more. It also provides further explanations for most characters, including how Shuro's resolve with Falin, the fate of Canaries unit, and even about Izutsumi. My guess why the author didn't include it in the main series because it will hurt the pacing, cause it will be way too long to cover each character.
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