Consider it this way...
The UMAD pulled the 6 days of phone records because he is required to do so. He gave them to Freeze with a Sharpie, and said redact any personal numbers. Freeze is standing there with a Sharpie and a decision to make.
1. If I redact that number, it draws attention to it. The AD will undoubtedly see the number and look it up. Now, I have to explain the number to my employer and why I chose to redact it.Obviously, I know what the number is since I redacted it.
2. If I don't redact it, maybe, just maybe, they won't look it up since they are really just looking for the reporters' numbers. If they do look it up, I can play dumb or claim misdial.
I'd go with #2, also. But he didn't count on Nutt's lawyer (through Rosebowl) catching the number and taking the next step; requesting all of his phone records. That's what didn't him in. Clearly, UMAD pulled all of his records and recognized "the pattern" of inappropriate behavior. I bet they still haven't surrendered the records to Nutt's lawyer, but they will be required to. It certainly will be interesting when they are made public, which is inevitable.
Of course, none of this will answer the question of for whom the escorts were intended.