Alexandrian Imperial: Okay, another case of not necessarily an errata but desire for clarification...
If the army is commanded by the King or the Regent, you get 4 to 8 Pk (S), the Hypaspists/Argyraspids. From 324BC to 323BC you can regrade 1/2 to 3/4 of them to a mix of Bw (X) and Bw (S). So, if I've got this right, no matter how many you get, you've always got to have some of them unconverted as Pk (S). But pike are best in four ranks, so in order to have four pike, you have to buy all eight elements, then convert only half of them to the Bw (X/S) combo. Otherwise you're left with a remnant of pike elements, which are a bit on the vulnerable side.