18 years old
2.5 stars talent, 2 stars Linebacker, Cornerback and Safety
Intelligence: 12
Positioning, Agility: 7
Tackling, Blocking, Passing, Vision: 5
Speed: 16
Strength: 13
Footwork: 4

Fire. You could train him up as a viable cornerback, as his speed is almost good. However, you have two five star cornerbacks already, so the best he could hope for would be a reserve or special teams. On the market, you'd be lucky to get a bid for him as he is, and trained up, he might fetch a few thousand, but he won't recoup the wages you spend on him in the interim.

Fire him or cornerback.