Hey guys, Colts fan here. First off, I'd like to say congratulations on the hire. If you guys are happy with it, I'm happy for you.
I just want to warn you, however, that Arians is a very stubborn coach and a lot of us Colts fans were quietly glad to see him leave. He did an excellent job filling in for Chuck when he was out, and deserves to be commending for his contributions. Many Colts fans feel that he's actually a better head coach than he is a OC. The thing that would have me worried if I'm a Cards fan is his unwillingness to relinquish play-calling duties.
Even going back to his days in Pittsburgh, his tendencies are very predictable. He runs out of heavy formations while passing mostly out of spread. Very few runs out of shotgun and he rarely utilizes the TE's as passing threats in heavy personnel. The scheme itself is fine, but his play-calling is at times down right horrible. He calls long developing pass plays, regardless of the personnel he has around him. Your O-line is about as bad as ours was last year, and if he's planning on rolling out that same gameplan week-in and week-out with you guys.... good luck.
Andrew made him look a lot better than he really was. I don't know how many huge plays he made out of botched calls that were just extended by Andrew leaving the pocket or shaking off defenders hanging on him. If you guys don't have a Big Ben/Luck type to do that, your QB is going to get killed, plain and simple.
Hopefully Tom Moore will serve as a steadying force for Arians and temper his over-zealousness with the vertical passing game because if not, expect a high yardage, low point total offense (IF you have a decent QB.) The concept of a short, quick striking passing attack is completely foreign to him, and it's what got him ran out of Pittsburgh in the first place. I wasn't excited when we hired him last off-season, and it's a blessing (to me) that things worked out the way they did. Best of luck to you all. I hope it works out, but I, for one, am not the least bit sad to see him leave.
PS,
Watch out for 5-wide on 3rd and short, and plenty of bubble screens that get tackled behind the line of scrimmage!