Wow , I am impressed at the case you built against Kastelic and the 4th line!
As I stated, everyone can be better, but I will continue to minimize it.
The Senators have has 9 empty net opportunities and have failed in every game. Only Giroux scored with the empty net, but it did not result in anything. The 4th line are nowhere near that scenario. The scorers are not scoring when it matters. The NYI is a classic example of that. The first game of the year. DeBrincat. Period. The Philly loss. The key players are not delivering. The stars are not shining, at all. Batherson, Tkachuk, Stutzle, DeBrincat, Giroux and Chabot have not won a game when it matters (Just DeBrincat, once). And keep in mind the goalies are not making saves when it matters.
So yeah, the 4th line's contribution to this season is incredibly trivial, and personally, just minimizes how big of a disappointment the top players have been.