The Four Lords and the implications (spoilers)

[Jonnycbad]

He's Tenzen, in the sense that the Tenzen of Hydaelyn is clearly very similar in appearance to the Tenzen of XI, but unless outright and unambiguously stated, homage characters are never literally the same as their original versions.

As for Iroha, she's a a special case, because she showed up during an event (the only exception to the above rule outside the Omega raids).

And Shantotto