That'll work. Lets say since they have legs they have a slight advantage over the minions since very few actually have legs. If they stayed in their caves then the only real threat would be from the Kraken and even then that's a big maybe 'cause its tentacles wouldn't be able to snake into cave systems without assistance, but they can't stay in their caves forever and so that's why they brought their chosen and leader to the meeting. 

I'd say your all set and free to make a CS whenever your able, also scrounge up a leader to be present at the meeting. The leader doesn't have to be too in depth, just a name and some bare facts.