Signed in 2008 at the Bronko Nagurski Charlotte Touchdown Club awards banquet. Not sure who signed this football.
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National Football Foundation site lists the following 5 finalists for the Bronko Nagurski award: Jerry Hughes, Rey Maualuga, Brian Orakpo, Alphonso Smith and Brandon Spikes.
From top to Bottom
Jerry Hughes wore #98 at TCU
If there is a 5th signature it might be Rey Maualuga #58 at USC.