Yes I know I am biased.
Mack did catch the ball in College and has that ability. The Colts just never throw to him or have designed plays to throw to him. They did in his rookie year and now just never do. It is very difficult to be reliable in the passing game when you hardly ever have the ball thrown to you.
Also, Mack is the Colts first 1000 yd rusher since 2007 with Addai.
But now it's let him walk?
Edit: I forgot Gore had a 1000 yd season in 2017. Point still remains though. The Colts went 10 years without a 1000 yd rusher.