the 4th line should be a line that's a pest, someone that can skate, hit, fight, irritate, shadow the other teams top lines and keep them off the board and frustrated. Like I said the ideal makeup of a 4th line would be Calvert, Dmac. Look at NYI's 4th line currently, that's the proper makeup of a 4th line.
You seem to keep wanting to go back to the "why can't we just put 4 scoring lines out?" Because that's not how you build a playoff winning hockey team. Like I said before, there's a reason why you don't have 10 wide receivers lined up with the QB in football. Not sure how else to explain it.
Letestu, Chaput and Karlsson are not 4th line guys. both are nice players, but we are very deep at center now, to the point we have Boone and Arty playing wing.
There's a reason our 4th line was crap the first half of the season and NO it wasn't just because of Boll.