In theory, Marcella's situation should have moved the balance of the battlefield in Heaven and Earth's favor.
The fact that so many of the landmass' powerful experts were ganging up on a single privileged cultivator would normally give Heaven and Earth's forces the chance to use part of their numerical advantage.
Decumia's actions had moved that advantage to Noah's side, but only when it came to the underlings. Heaven and Earth's forces still had more rank 9 assets, and Marcella was absorbing a lot of pressure on her own.
Heaven and Earth's forces could divert their attention to easier targets to widen that numerical gap among elite experts. However, Noah, Alexander, the time dragon, and Divine Demon were so troublesome that they prevented that outcome.