I've been a Tressel fan since his days at YSU where I watched his teams play in person several times, but I sincerely think some folks are in denial here.
"I didn't know what to do." - Sorry, that sounds like a lie. He's not stupid.
"I was afraid to disclose the emails because of confidentiality and the investigation." - Sorry, but that sounds like another lie, now.
Added to the compliance statement in September and the lack of disclosure in December it is becoming increasingly difficult to see any other plausible explanation than Tressel/tOSU wanted to keep this violation hidden from the light of day. It looks like the classic case of the attempted cover up being worse than the actual crime. It doesn't matter how silly we think the trinkets-for-tats rule is, it's a rule. He knew it was a violation, if true, and it needed to be investigated ASAP. That either didn't happen, or it did and it was not disclosed to the NCAA. Either way, we're screwed there.
The truly sad part is the punishment for the initial violations would've been the first 4 games of last season for 5 players if everyone had just come clean. It would be water under the bridge by now. Instead, it is 5 games next season, and potentially 12 wins erased last season, and Tressel's/tOSU's reputation at a minimum, his job at a maximum. It may even get to the point where tOSU has to dismiss him, as Tennessee just had to do with Pearl, to avoid major program sanctions.
What a mess. What a shame. :(