OK, for me this is a very difficult question to answer, (no less because as for Lofa and Niko, I have a personal interest), but I feel that this will be by far, the most hotly contested race in training camp, so I just had to ask.
Tell me who you think will start, at what point in the season they will start, and why you think so.
As for me, I personally think that Niko will start the season at MLB, but that Lofa will play about 40% of the time. If Lofa outperforms Niko, then he will slowly be given more playing time until eventually he is the guy getting the larger percentage of plays.
I realize that this question is almost impossible to answer without seeing any preseason games, not to mention that they aren't even in training camp yet, but hey, it's fun, and no one will hold you to it.