I don't think BB starting Mac says anything about who he "likes". It's largely down to the fact that Mac is further along his relative developmental timelime, they need to learn what they have in him, and he earned the right to start based on his leadership, work ethic, and time he's invested over the past 14-16+ months.
If Zappe ends up starting next season, does that mean BB flipped from Team Mac to Team Zappe? Does it mean he no longer likes Mac? Caught the Zappe fever? No - it means he thinks starting Zappe is what is best at that point in time, and all of the considerations that go into that. Ditto for Mac starting now.
BB isn't picking the starter based on which faction he sides with in an online messageboard feud; he's coaching a football team.