He only played 8 seasons and 1 of those was 35 points in a lockout shortened 35 games. Here’s some more the other 2 were his rookie season and his second year where he played on the third line with 46p in 70 games. And now to round of my point. When tyler ennis joined the team, which is a requirement for your comparison, he had 69p in 80 games 19+ mins, 35 points in 35 games 19+mins, and the bad season that caused people to want him gone where he still played 19+ mins with 44p in 80 games. In his 8 years with the Sabres he played 18+ mins a night in 6 of them. By contrast thompson plays 18+, drury played 18+, Bergeron played 19+, so he played first line center minutes and played more minutes than tim connolly. Clearly a 1a/1b situation, but he still played the 1a share of the minutes.
Now if you wanna say that mitts and roy have a ton in common up to this point in their careers, ill buy that, might even suggest it myself. But to compare end of career derek roy to rfa casey mittlestadt... cant, we'd be lucky to have the next 5 years of mitts come out like roys did. But Roy got dumped into a first line roll at this point and the team bottomed out and fell apart.