What is wrong with Turbin is that he should have never been used that way.
He wasn't/isn't a good kick returner.
He is a guy that can get through the line fast, for 2-3 yards. That is both his ceiling and floor. On a 3rd and 2 or 3rd and 1 he can be surprisingly useful, more so because Lynch has a longer wait to get up to speed so he isn't a gimmee on those short yardage carries (unless near the endzone).
Turbin can also receive the ball and run well with it. So he can be a threat if you use him that way, but asking him to field kickoffs is brutally misguided.
Blaming him for that one is like blaming me for missing a FG, it would be your fault for asking me to kick it in the first place.