I think there is a good amount of variety, and you do have to think about size, in Cricket 2004 the commentary all adds up to around 130mb for two commentators, we will have more names and lines in TCP so each commentator would weigh in around 70-100mb. 600mb for commentary is quite a bit, but worth it for variety, any more and it's going to make TCP hard to download.
Commentary is going to take up a huge amount of space, so there needs to be a balance between variety and size, and I think 6 seems to be that balance.