Beelzemon, known for its immense destructive power and status as a top-tier Digimon, could potentially lead the 'Nightmare Soldiers' army. Its love for conflict and refusal to retreat from battles, coupled with its powerful 'Oblivion Cannon', make it a formidable contender. However, the army, led by Gravimon and primarily composed of God Beast Digimon, is renowned for its superior military power, posing a significant challenge to Beelzemon's leadership aspirations.