There are... 3 or 4 other Draconian groups out there, bigger than the ones in the MWG if their power is to be believed.
Don't try to defend yourself against something so... futile?
If there was a real group of Draconian re-emergence, 15 ships would disintegrate upon reaching the GC. A battle fleet would be sent, because the Draconians have a tendency to appear in force. Very strong force, and they do not like being undergunned or undermanned, and have it publicly known to the biggers.
Either your roleplay-generals are very dull and are simpletons, or they are extremely arrogant and self-confident, sure that they could completely stomp any Draconian, regardless of fleet size or strength. Your 15 ships were neither readily-defended by heavy shielding, nor were they stealthed in any fashion.
And if you say that the Draconians are completely extinct, gone, nahda, then you're most definitely wrong, unless you're in a few dozen different galaxies with a few dozen different sentient creatures that may or may not attempt to annihilate you. If there are, what, half a dozen in one galaxy, then how many would there be in dozens of bigger galaxies with Supremes creating little projects to see what happens?