How about this (not really serious I guess).
Kinzo died. Japanese taxing laws makes his death being something official a major loss for all the sibblings. They made a deal (last year) to hide his death permanently. Uppon learning of the deal, Genji decided to keep Kinzo's corpse to eventually get the upper hand on all the Ushiromiyas, which is what really occured in arc 4.
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