MCRN strike group got all the way to the Ring from Ceres before Drummer got to Ceres from the Belt.
MCRN strike group also got to the Ring from Ceres before Marco who headed out to the Ring from Ceres, before the Inners even arrived to Ceres.
Due to last known location of the Pella, MCRN still has a chance to catch Marco before he gets to the Ring, but only if they head out right now.