Personally I don't care if Bran lips or not. However, I've seen ppl swear she's lipping when she isn't, and vice versa.
Several producers have stated that Brandy's voice is a computer. Her mic usually has an echo and/or reverb. Those two things combined can have queen sounding studio at times.
Producers have also stated that she can match notes precisely, so much so that it cancels out. There are times when Brandy is singing with a back track but it sounds like only the back track because she's so spot on. Trying to minimize her abilities by comparing her to Fantasia, Monica, Usher, and Jazmine is foolish. Most of those people know how beastly she is, and Fantasia even said she is reserved about sharing a stage with her.
If Brandy was an average singer who lip sung every performance, I promise you the industry would not support her being called a Vocal Bible. With the amount of jealousy amongst female singers, I find it hard to believe that no one would call her out on it.
With all that said SS was lipped and Border was not. The mic was on the entire time