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In most cases, if an aircraft reaches the very top of its BR in efficiency and leads by a considerable amount, it therefor moves up to the next bracket. As far back as August, we explained how the Mk 24s efficiency was already very high and showing a clear indication that it needed to go up, but due to feedback, we decided to delay the move up to allow more time to collect further statistics and see if the rise continued:
By the time of the next BR update, the Mk 24 had climbed even higher ahead of all other aircraft at its old BR. So it simply was not feasible to keep it there any longer when it lead its BR bracket by such a considerable amount. Naturally all vehicles tend to, over time, find a BR that ideal sets them in the middle. Rather than the extremities of the higher or lower limits.