The Colts struggled because they are weak across the board. WRs 2-5 are below average when not catching Manning balls. Their OL is a train wreck. Their DT are non-existant. Their LB corp is terrible. And they don't have a SS or a 2nd CB. They have good (aging) DEs, good TEs, and a handful of other above average starters (Powers, Bethea, Wayne). Not sure why you won't objectively look at this.
FWIW, Jerry Hughes was a healthy scratch.