He was working with team doctors over what seems a fairly easy thing. Going to the Specialist says to me he wants to get better quicker than they think he will.
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Sure if you have the resources available and you feel they can help, do it. I just said seeing the specialist is a cue to me that I doubt he thinks this is his last season. Either that or he did not like the info being given by the normal doctors.
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My main point was I don't think Manning thinks he is playing his last season.