Juist throwing in some of the hard hitting EXs with Lv/40 awakened Bahamut summon.
The difference is upon entering the summon phase, all characters would have their EX fully recharged and Bahamut would grant everyone a 1 turn of Megaflare buff. The buff also ensures that said character's EX remains charged after using their EXs. So it is basically a full 6 turns (or more if you retain the buff or the buff just fall off) of EX spamming buffet.
While it only gives the generic 10% HP dmg cap increase like the other Lv40 summons, unlike Ifrit with the hellfire buff, it can still be a very strong pick for summon with certain character configurations. As seen here, Seymour, Prompto and Prishe wiped the 3 manikins just as quickly as how others do with Ifrit summon. So other characters with devastating EX or EXs that give additional benefits, such as polyglots for Papalymo would have a good time using it.
Hopefully Caius gets his C90 soon, so he can get the benefits of spamming his EX alongside the additional break bonus of using Bahamut.