Powers is the only proven big time talent in this group, King and Vaughn were good additions adding some much needed experience, the hope is that the other 3 will all take it up a notch, benefitting from the reps they got last year.
Bethea has been the glue in the secondary for years and is one of the leagues best, Zbikowski will quickly become a fan favorite and a solid player, The 2 young guys have looked good and should improve.
Adam and McAfee provide the Colts with a major edge with both being among the leagues better players at their positions. McAfee rebounded from a subpar 2nd year and should continue to get better. Snow (as of now) will be back for his 13th year! There are quite a few potential returners in the mix and this should be a plus for a team that hasn't had a good one in years and there is always hope with the new coach that even the coverage units will be .....better.
summary: the offense is in decent shape with the noted expectations of some of the new players........... the defense.......... there is some bigtime talent (playing new positions),very little proven depth, in a 16 game season, without depth, unless you are really lucky ( injury wise) you will get exposed, adding a new system to that mix, I expect the defense to have their share of struggles, if everyone is healthy and plays their a-game, I still think it will be overmatched.......... the special teams, for the first time, in a very long time, should be a major plus and it will be needed