Also, if you can't see that Tahno had no purpose to the overall plot, you're blind.
You have a legit point about Tahno, but you're completely off base about that other dude. He had significantly more plot significance and was a much more interesting character, and his development and downfall was handled in the exact same amount of episodes (which is 2 by the way). You cannot tell me that's "fine" pacing. Well I guess you could, but I probably wouldn't take your opinion in this matter seriously.
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Bunny... :3
http://img.imgcake.com/baronvontoast/0413121622bjpguh.jpg