Let's think about it.
Defenders have 5-8 spawns Attackers have 1 spawn
Defenders spawn at the same time Attackers spawn 1 per second
Defenders spawn when battle starts. Attackers spawn 1 minute after battle start.
Consequance of those differences:
Defenders rush and take attacker's spawn and take all their equipment.
chadz's Possible Expectations about this weird implement:
Defenders need some time to settle their defensive positions against attackers.
Result