Saw this linked over at 11W, seems that LTT was burning that letter from tsiO for more than loyalty to UM. According to the article tsiO fans pulled some shenanigans while he was in Columbus for the NFTC. Stories been covered already, but this gives a little more insight.
"(I) think about 'The Lion King,' Simba gets hit over the head and (he's told) 'the past can hurt,' " Harbaugh said Monday afternoon. "'You can either run from it or embrace it and learn from it.'