Phil: there *is* a parting resolution/explanation for the Sinclair situation in the first episode of next season.
In two episodes, you will discover: a) what happened during the 24 hours missing from Sinclair's memory; b) why the Minbari surrendered at the Battle of the Line; c) what Delenn has turned into; d) what G'Kar found on his expedition; e) the fate of Garibaldi...and a bunch of other stuff.