Don't think they break up that 2nd line quite yet, they've been firing! Toffoli Monahan will get a shot together I think, see if they still have the old junior connection I just think it will be with MAngiapane down the road, let him drive play on that line and let Dube ride back seat with Coleman and Backlund.
I think for now it’s easy to get him in the lineup, leave everything as is, and just swap him for Ritchie on 3rd line RW. And see what clicks. Maybe change up 2nd PP to see what could develop between Mang and Toff