In the 5v5 Megas match:
Metal Burst is fixed damage with the damage being what you used as a BAP instead. Also cannot crit.
Moreover, you forgot the effects of both Sun and Solar Power in all 3 Flamethrowers, this prevents the Metal Burst Combo from ever happening
Drought is M-ZardY's ability and costs 9 EN on send out to make the Sun for the above.