Given the scale of the Rumbling, was there any outside force or strategy that could have stopped Eren and the Colossal Titans, besides the Alliance from within Paradis? Could global military might have made a difference if they weren't so fragmented?
Nope, it was unstoppable. Millions of Colossal Titans marching across the world, heat radiating off them. Any air or naval fleet would just get melted or crushed. No chance.
If the world militaries had united and developed anti-titan weaponry BEFORE Eren started, maybe. But once he initiated it, the sheer numbers and speed were overwhelming.
They could have tried to bomb Eren directly, maybe with some super-advanced conventional weapon. But finding him among millions of titans would be needle-in-a-haystack. Plus, Founding Titan hax.
Perhaps a truly united global front, sacrificing entire nations to create chokepoints and using a WMD. But that's a huge 'if' and morally grey. The Alliance was the only real option.
The only thing that could have stopped it was the Power of the Titans itself, which is what the Alliance used. Conventional weapons were useless against that scale of power. 🌍