A guy like Schultz actually could have a huge influence on how the whole unit plays. He plays passive, so his partner is forced to also be conservative, and then it puts the forwards on their heels, as well. I absolutely believe that one guy who doesn't close down can tilt the whole ice against his unit. And if one unit of 5 gets caught on the defensive, that can give momentum to the whole opponents' team.
So simple 20% of 25% kind of estimate doesn't begin to describe what a passive player can do to a unit, IMO.
Actually, a guy like Ovi has always been guilty of it, as well. When the other team puts Ovi's line on the defensive, and Ovi is lazy to close guys down, it really helps the other team cycle in the Caps zone. Thankfully the players lining up against Ovi are usually more defensive minded, so they dont convert their chances very well and have to be wary of guarding against Caps' breakouts. But with Schultz, he kind of sucked at what is basically a d-man's bread and butter, and that was trouble.