What opening shape should you strive for? Should you try to get neighbors advanced, or make the array more jagged by advancing non-neighbors to take the 4th rank? (Your powers may make a difference to this - recruit radial for example wants to be next to two enemies more than two friends - but this post will assume no powers).
My current answers to these questions are as follows (and if better players have different beliefs I would love to know)
First off, in some sense it is clear there is not too much difference because the set up is likely fairly symmetric. That is - if I think a jagged set up is an advantage, by making it I give you a jagged set up. If I think having my pieces being next to friendly pieces is best - by striving for that I make it easier for you to get that shape. So given two equal players I don't believe striving for a particular shape will make much difference.
However, if you advance your allies together there are less places you can bring an attack on your opponent. I am sure you have played a game where both players advanced their army from their left to right so that the board was 5 pieces in a row on rank 4 for both players. In these games there is only one place you can really exchange pieces - in the center, and with orbs in the wrong places you can easily be giving your opponent orbs in these exchanges. These games can't inherently favor one side or another because the set up is symmetric, but the nature is very different than games where every other piece of a player is advanced to the 4th rank. In these games there is a lot of opportunity to attack and make exchanges.
My current theory is that if you are against a player who is much stronger than you then you should try to make your pieces on the 4th rank have neighbors - because the more that is true the more the orb drops matter and less the skirmishing. If you are playing a weaker player you want to get lots of pieces neighboring enemies in the middle so you have lots of opportunity to stall and exercise your skills. If you are about equally skilled I think the 4th rank having friendly neighbors will make the game swingier.
This may not be understandable without diagrams - if so I apologize for being too lazy to figure out how to make them.
