It does make me uneasy with them announcing at the same time. There's several different ways you could look at this:
1) I do believe JRM has said several times that he would like a USC offer. As a longshot, they both commit to USC on the 16th.
2) I believe Ramsey is visiting Vanderbilt again right before announcing. One of JRM's finalists is Vandy. They both commit to Vandy on the 16th.
3) UT's 2nd Summer camp kicks off the 16th. Ramsey and JRM blow open the floodgates to what could be one of the most successful UT camps in a long time by committing to UT on the 16th.
4) They really are just trying to put Tennessee in the spotlight by committing on the same day, but they commit to two separate schools.
I'm leaning towards #4, but who knows really.