Another crew will takeover for the SBC-MYS run. Its just the loco that will be used.
Locos coming with daily trains like Seshadri and Island usually have long layovers at SBC. They can be used for the SBC-MYS runs. Also, with the GNT-GTL electrification now complete, e-loco availability at GTL will increase in the coming months, and trains like Udyan, Hampi will also bring in e-locos. It may take a couple of months, but loco availability will be good.