No. You missed my point. What I'm suggesting is that in order to be successful, teams generally need an identity. The players you acquire need to help build that identity. I believe the times of having a rugged 4th line that only plays 5-8 minutes ES are over and you need 4 lines that fit your identity.
If the Pens go out and get 1-2 rugged players with the specific intent on protecting Crosby, does that change their identity? Do those players fit into the identity of the Penguins?
My concern is that having players focused on protecting Crosby might take the team's focus off the 'just play' mentality and discipline that Sullivan has preached to this team. They've been extremely successful by turning the other cheek, mostly staying out of the scrums, not retaliating, and just playing hockey. We've seen this team get thrown off in the past by resorting to trying to play to other team's identities (see Flyers series in 2012 and even Boston series in 2013). It hasn't worked.
Now if you can go find a skilled player with speed, size, physicality + ability to punch, and doesn't have a knack for taking stupid, undisciplined penalties, then sign me up. However, I would guess along the way to finding that player, you might run into a few unicorns.