I think you are right, and I do agree. However, 4 starts probably makes the most sense. There are 7 days in a week and 7 starts in a week. The all star week only has 4 days, thus 4 starts. Some teams might only have 5 starters, and as you pointed out, they may not all get a start that week. I think 4 makes even more sense than the 5 I mentioned. I agree with you that it's the equivalent of 7 for a full week since either way it's an average of 1 per day.