>That's right. Kagato recognized Tenchi-ken as "the Kings 
property".  Since all keys known to us look quite different this 
seems significant.

We know there are more master keys, but I don't believe they look 
alike.  I still think Tenchi-ken could very well be some sort of 
symbol of rulership over Jurai, hence a very special key.<

     The 101 Mysteries states that Azusa's Kirito-no-ki is the 
only _officially_ functioning/partnered first generation Tree 
because Funaho-no-ki is without a vessel and rooted on Earth.  So, 
while there are probably other first generation Trees, they are 
either unpartnered or their partner is deceased.  Hence, Azusa's 
master key is the only officially existing one.

     However, Azusa's real master key is his left eye, which is a 
secret.  The sword that he carries is just a another device made 
from Kirito-no-ki.  *Kagato would not have known that.*  Even 
Shank guild pirates know that Juraians carry their keys on their 
person and when they demanded that Azusa hand himself over or they 
would kill their captives, they took his weapon, thinking it was 
his key.

     At best, Kagato could have found out that Yousho carried a 
sword/master key called "Tenchi", which might have matched with a 
legend that he uncovered from the pre-cursor relics that he was 
plundering.  Hence, he probably drew a conclusion based upon what 
information that he had.  Who knows, possibly Youshou carved his 
key to be similar to his father's sword.  That's a very real 
possibility and might have contribute to Kagato's miscalculations. 

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