Seems there are a lot of differing opinions on Troup so here's mine.
With a lot of spare time lately I have replayed most of the second half of the season and what I saw of Troup was:
1)player who got more and more time on the field.
2 most snaps he took on double teams and held his gap pretty well, althought he didn't get a lot of upfield pressure(lack of strength)he rarely was pushed back
3)diagnosed most plays and made good effort in pursuit, had some trouble disengaging from blocks
4) made a few decisive stops,didn't look lost,didn't take plays off and overall as a rookie I think he showed very good
From the tone of a lot of posts here I get the feeling you all expected a second round DT to play like a first pick of the draft.
I saw a young player who got better and better that could become a very big part of our defense for years to come.