Gordon knows of what he speaks. Lidge looks totally at ease throwing his cutter and seems to be thinking way too much about his mechanics on the slider. Right now, his cutter is coming along nicely. If infielders will stop booting the ball around when Lidge induces the groundball, he'd be much better off.
The backup slider is a pitch that Lidge leaves over the plate quite often, but when he throws it well, it has the biting action downward enough to cause the swing and a miss. It looks for all the world like a slurve (slider with curveball action) to me. If he gets a good feel for that pitch to throw for strikes, his 97 mph four seamer will become a very good pitch for him because no one will be sitting dead red all the time on him again.