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Think about it.  On the Soja Tenchi was cut off from
the Tsuanmi's power thus the Master Key was useless to
him.  If he was cut off from Tsunami he would have
been cut off from Funaho also.  In ep 13 Yosho
referred to Funaho as if the tree was still his tree. 
All of this points to the idea that Yosho is still
bound to Funaho and the Tenchiken is the key to
Tsunami.  Must of this is what is supported by what
others in #WASHU#, #SAS#, and the RFFC were able to
find out when this was debated before.
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I'll add my $.02 here: I thought the Tenchiken was a master controller for all 
of Tsunami's descendents, but not the Genesis Tree herself.  Why would Yosho be
in possession of the key that would control Tsunami -- if such a key existed, 
wouldn't it be in Azusa's possession?  As the Crown Prince, I can see where 
Yosho would have authority over Tsunami's arborial offspring -- but it would 
seem to me that Azusa would reserve the highest-level functionality for himself.

                Jeff

Jeffery (Jeff) Harris
JLHOnami@mchsi.com