That doesn't prove Toshiro and Matsumoto are alive. For all we know, Mayuri could have just left them there since he was busy with other stuff. He only took those two captains because he had control over them. Why not bring them with you when they are in your hands?There not, that's why we didn't get an update, its to keep us in suspense.
Notice 3rd and 9th division Captains are moving with Mayuri bur Toshiro and Matsumoto are not, why would he not be using them as well?
Besides, Kubo pretty much confirmed they are dead
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