Here's some interesting stats on Houck, especially if you think he is the best closer available.
In the month of June he has pitched in 6 games, pitched a total of 7.1 innings, registered 10 K's and just 1 BB, and given up 1 run for a June-to-date ERA of 1.23. The Sox won all 6 of those games.
In May he pitched in 6 games, a total of 17 innings, and gave up 11 runs (7 in one game vs the Angels and 3 in another vs. the White Sox, and 1 in the other four games and 12 innings vs the Rangers, Mariners, White Sox, and Orioles).
If you lop off those first two games, May 5 and May 8, Houck has now pitched in 10 straight games, from May 15 thru June 17, in which he has pitched 19.1 innings and given up 2 runs with 19 K's and 5 BB's.
So it sure looks as though the case for House is a good one and that last night was just a bad night in which he still got the save.
The caveat to the above is that in 9 of those 10 straight games Houck faced some pretty weak hitting teams: A's (2d worst team OPS in MLB) once; Mariners (8th worst) three times; Orioles (5th worst) once; Rangers (8th worst) once; Angels (10th worst) once; White Sox (9th best) once, and Reds (12th worst) once.