So he did not miss any time whatsoever in 2014. Missed a game or two around Sept 2015. He than sprang his ankle catching a TD (some Rams WR rarely do), also in 2015 and missed his 3rd game of that season.
Up until his Foot Fracture I see nothing of concern, just a WR being cautious with his body during preseason and practice, but who still played and performed on most Sundays.
He obviously went down and missed a lot of time with foot fracture in 2016. Bills also rushed him back in 2016 which probably set him back.