I didn't say that Sidwell was the right substitution just that KLL was the wrong one!
Personally, I don't like sitting back on a one goal lead though it's been pretty effective most of the season. Perhaps Skalak would have been a better option though I didn't see the game just listened to it on...
Much as I love Kaz, he loses the ball too often and is crap at defending, so I don't think he would have been the right substitution at that late stage.