i don't think anyone is arguing that a rookie (skjei) and a fringe AHL dman (Summers) are better than Girardi...
The defense was bad before Girardi was out, and it's just as bad now. The team is in a serious funk, and there's a problem both in the locker room and on the ice... however, both Skjei and Summers have a cap hit that is 1/5th of Girardi's... That's a serious issue--if you don't see it, I don't know what else to tell you.
Girardi doesn't *fix* any problem on this team. He's simply a placeholder at this point, a placeholder that is taking up 8% of the teams salary cap