WI: Sparta wins at Megalopolis

A interesting, often forgotten point in history is Sparta's role (or lack thereof) in Alexander the Great's campaign against Persia in 334 BCE.
Refusing to participate in the League of Corinth first during Philip II's then during Alexander's reigns, Sparta had, while the latter was fighting in Perisa, attempted to seize back control of the Peloponnese from Macedonia in 331 BCE.
Though aided by the Persians and a large Greek mercenary force, these plans were extinguished by Alexander's regent Antipater at the Battle of Megalopolis.

But what if the opposite came to pass, and Sparta was able to decisively defeat the Macedonians?

Could Sparta continue to march north and actually unify the League under it's own banner?

With Antipater probably slain during the battle, would Alexander be forced to return home and crush the Spartans?
 
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No takers?

Well if I we're to guess, it'd force Alexander to at least consider a peace treaty with Darius in order to buy time to sail home, which if taken would butterfly Gaugamela.

More importantly though, Agis III winning would inexorbly break the League of Corinth and put the Macedonian homelands under threat
 
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