He struggled with several concussions. He was out for an entire year. For some of it he could not even work out at all - no weights, conditioning, etc. He came back second semester last season after sitting 12 months and had a pretty successful return. He has been healthy since. He wears protective headgear now due to his past concussions. He won a wrestle off with Wilson before the concussion issue, but I am not sure how much progress he lost being out 12 months. Manning seems to talk very highly of Wilson and seems to think he will be the starter there, which is obviously the best source.