Akaiyou wrote:You don't need to necessarily have the warlord preselected, the warlord is selected when you are going to play in the preparing for battle phase, just before selecting missions.
Let's say you are asked by a random stranger for a game. You haven't built a list yet but you know what you'll be facing. You build your list with two HQs and wait for your opponent to do the same, then you select your warlords and play the game.
The warlord shouldn't be forced to be selected whilst list building in army builder. Because it's a part of starting a game not a requirement for list building. By default you will ALWAYS have a warlord, as you are required to have 1 HQ in all armies, so not deciding your warlord shouldn't cause an error in AB as some times you'd like to try having the other guy be the warlord.
Again...p111 of the Rulebook states you must pick a Warlord when choosing your army.
Of course you can still save and print the list without the Warlord. I have dozens of rosters pre0made and printed that I bring to my LGS 40k nights, so I am always prepared with a list. For those I don't pick a Warlord as knowing the opponent can make a difference.
However, for Tournaments you would have to have the same Warlord for all of your games as it is part of the Army Selection process.