I dont think its possible for them to cutoff resupply currently. This might stall out until election time.Badhaadhe, Kudhaa, Ras Kamboni etc... don't matter. What matters is who is in charge of Kismayo. I don't see how an SNA that couldn't hold Ceelbuur is going to take Kismayo, a city of >400,000 poeople.
All Ahmed Madoobe needs to do is keep the peace in Kismayo, and cut off resupply of these troops. No one needs to die, and there is no need for any fighting.
Kismayo can only fall to itself. Morale is higher now then during Farmajo thanks be to Allah.