I think you're both overstating the value of our 4th line LW slot and understating Clifford's actual abilities. You should look at 4th lines around the league and realize that Clifford is actually a damn good player. I'm not so sure Mersch makes him replaceable as it seems like he's the kind of player who needs to play with talent to use his offensive skillset (i.e. Dwight King) whereas Clifford plays his banging role to a T and has speed and decent puck protection to go with it (can't knock Cliffy's skating, that's for sure).
That being said wow, those are some big words from Blake, very high praise, they seem incredibly high on him. They've had extremely high praise for Mersch, Weal, and to a lesser extent O'Neill, makes me wonder what their plans are!