Yes
No
Adjective:
(esp. of a position or view) Not able to be maintained or defended against attack or objection: "this argument is clearly untenable".
Synonyms: indefensible
So I don't think I've used the word in the wrong context here, but I bow to your superior wisdom.
And I'm not saying we should get Owen Coyle, that's just another smokescreen created by the pro-Wenger brigade to counter any criticism of the man. Yes, there are better managers out there at the moment, because I wouldn't put Wenger in the top 30 managers in the world at the moment.