Haha, this is what we're basing this on now? Pro-bowl? Ingram had FOUR games last season that showed a good performance. That was all. Outside of that, he was mediocre.
I ,unlike you, actually watch and analyze games. New Orleans was willing to run the ball when Ingram was finding holes, they didn't run the ball when the guy was rushing for under 4 yards a carry. How many games was that? 6 games, and he missed 3 games last year.
You are downgrading incredibly from Murray to Ingram. You are getting a far slower, just as injury prone (Maybe even more so), and less powerful back in Ingram. Not to mention, he's not much of a receiver either.
You don't bring a change of pace back in to replace a 3 down RB.