Those lines had won them 6 of 7 playoff games before Wilson got suspended. They were on a roll. Not mixing them up after it was clear that top line DSP wasn't working was a bad decision but those lines were working very well and had no reason to be broken up. In fact, those lines he rolled out in G4 were almost exactly what most people here wanted to see... they just didn't work. Trotz is certainly not without his warts but you're looking to confirm your own narrative here, in my opinion.
so, if they clearly didn't work... why is he keeping the same? the top line was on the ice for no high danger scoring chances for, and 7 against. Ovechkin, our most dangerous shooter, had 0 shots on goal. but yeah, i'm totally just pushing a narrative here. You're right. let's just have a useless first line again for game 5.
the fact that he's not adapting at all is incredible.
also, you're right that a fair amount of people wanted to try him on the first line. operative word there is 'try.' it became pretty evident after a few shifts that he did not belong.