After playing Halo 4, did the Forerunners come off as weak to anyone else? Cortana is considered an advanced/evolved Ancilla by the Didact, which implies that Forerunner Ancilla aren't that different from Cortana. A single nuke can completely destroy Didact's ship. Forerunner weapons didn't seem all that strong. Didact was much shorter than 15 feet. A single shot from a Mammoth rail gun can destroy massive Forerunner structures.
I am not complaining, the campaign was great, but the Forerunners seemed weak after the Forerunner trilogy hyped them up.
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Regarding the nuke inside the ship, it isn't the nuke that destroys the entire ship. It's the nuke reacting with the core and with the energy of the composer that does it. The ship's core explosion would probably be enough to explode most of the ship, and the composer's energy would only increase its size. The nuke just causes the chain reaction that causes the ship to blow up.