Coleman is bad at using leverage on those boundary throws. It wasn't a perfect pass but it was there to make a play on but as usual he is looking for contact like a basketball player rather than using leverage to separate.
He has had a couple of poor throws. The deep ball is on Keon. The 4th downs sneak was a bad center - QB exchange (altho they also failed on it on 3rd down which was more on him).
Keon ends up trying to grab it as it crosses the line but at waist hight. If he has boxed the defender out properly he can high point that in bounds and get his feet down.