The old man is not Sahasrala. Rather he is the villiage/island elder, his name is rumoured to be Shiwan.

And the final villian

Spoiler (Highlight to read):

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Bellum (Beramu) is not the true Ocean King, he just says he is.

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There's a picture of him on wikipedia if you want to see him.

__________________

I K A R U G A
I am not alive, thus I can't die.
I won't give up even if my Ideal isn't fulfilled.
My will, just as my regrets, won't ever end


New Music Video - To Stay Myself - Twilight Princess