As to the OP, as I said elsewhere, if you're paying attention, SMG is no longer truly the lead of the show. It has become an ensemble cast already.
In Act 1 she was the protagonist in almost every episode, virtually all dialogue was between her and the other characters, and her actions were generally the pivotal ones to saving the day.
In Act 2 to date she's no longer the focus of the series. She's one of the focus points, but all of the main characters are being given roughly equal footing. She gets to "lead" the A plot, but the B/C plots involve other members of the crew doing things integral to the mission completely independently of her.
You say this a lot, but the fact is the A-plot still revovles around Burnham, and the A-plot is where the central focus is.
Sonequa/Burnham is still getting the lead treatment. Sadly, it's her story and the others are just along for the ride.