I guess MS is the "safe" selection, until Coach Lavin sees which of the incoming players demonstrates "leadership" skills. I am not sure MS has demonstrated such skills, and sticking with the team is not the same thing as being a leader. But having said that, it gives Coach some time if MS is chosen. It also avoids any bad feelings among the new players if one of them is selected, say DH, and another is not, say NL.
The problem with selecting one of our untested (as a team leader) incoming guys prior to the season is you are "stuck" with that choice for a number of years. We seem to have a few potential candidates, so I would wait before I give any of them the TC title.
You know, based on every thing I have read over the past several months on our incoming players, I can see Sir Dom as a TC in the future.