Is it better to for only a few of your best teams for the guild wars or form as many teams as possible? We've only had one experience with a guild war and it was easy the next one is going to be more challenging.
While sending a lot of teams is good in general, it will be detrimental if most of those teams are simply cannon fodder. The worst thing that can and often will happen is that your weak teams simply allow the enemy's team to gather energy, hence crushing the next team they face with their toes from the beginning.
In short: don't send weak teams in masses usually.
Another question. As I've been through 2 battles now. Should you design your team with some healers. I see now that you fight until you die so it seems healers would be a good idea, or do you start each battle with fresh health.