I don't want to "bash" the guy because I was a linebacker for a reason

and
it's not his fault he's undersized.
That being said, he's getting beat FAR too often for a high D1 level corner. Some of that could be attributed to our horrid DC, who of course is also the d-backs man, running the same set 98.32% of the time with no press coverage at the line and/or a 12-yard cushion. His angles are sometimes questionable along with tackling (however that's the entire team and nobody is ever perfect).
Not saying he hasn't worked hard, or hasn't made some good and great plays, but this season has been more than a bit of a struggle for him.