WI Olympias had one more child, (year or two after Alexander), a son (Amyntas)? *Amyntas* is moderately competent and loyal to Alexander. I guess Alexander would take Amyntas with him to his campaign (like he did with Arrhidaeus) just in case-to avoid any risk of rebellion at home.
So with adult and menthally healthy (menthally healthy Arrhidaeus means dead Arrhidaeus, thus why I needed another son of Olympias) brother around, succession after Alexander should be way smoother than IOTL (still, Amyntas is propably going to get rid off nephew to avoid future troubles). Could he consolidate brother's empire if he is not so fond of conquest as Alexander was*?
* That is why I've choosen this scenario over longer living Alexander.
So with adult and menthally healthy (menthally healthy Arrhidaeus means dead Arrhidaeus, thus why I needed another son of Olympias) brother around, succession after Alexander should be way smoother than IOTL (still, Amyntas is propably going to get rid off nephew to avoid future troubles). Could he consolidate brother's empire if he is not so fond of conquest as Alexander was*?
* That is why I've choosen this scenario over longer living Alexander.