1. subordinate; subsidiary.
2. auxiliary; assisting.
That's appropriate. He's certainly subordinate to Olive.
Caesar is #2 guy in kingdom, one with most power to make a play for #1. Don has had several children already try to backstab him.
So if Don was to spy on someone, likely would be Caesar as he would likely be at least a pawn in any revolt as his the heir. (No point replacing Don if the Heir isn't better puppet for you).
Whole thing is rather complicated. Even if Don ordered Bunny to play spy, there is still risk she could still go native (become more loyal to Caesar while spying on him then to Don). A thinkomancer is better at playing puppet master in a revolt then almost anyone else including a chief warlord... she has hints on where *everyone's* loyalties lie, and she controls communication. So there is always possibility that Bunny is the real rebel, carefully putting Don and Caesar in conflict, so that Caesar takes over as her puppet. Does Don trust her, and if so for good reason?
I guess it will ultimately depend on the direction in which Rob wants to take the story. Don has become a rather fanatical royalist resently. Fanatics tend to ignore things that don't fit into their own preconceived notions. Don misjudging Caesar and, potentially, paying for it, doesn't necessarily make Don stupid, just overconfident and/or arrogant.
If so, I fear Wanda will have a miserable time of it at Faq. Or wherever, but Faq's the most likely suspect.
Especially since the better ones seem to be taken. Perhaps a Weirdomancer will give Wanda the flighing special at some point. I don't know what the only seeing the shadows of people may mean, unless it's some sort of Foolamancy. The being mocked and beaten is pretty self explanitory. It doesn't look like Wanda has a fun future in store, but we already suspected that.
I haven't got anything on the the silver scale mail yet. Reference to fish? Not sure.
From the late-second century until they were disbanded by Constantine the Great, the Praetorian Guard were known for wearing scale mail. Especially fine scale mail, with very tiny scales, was also a sign of officers, since the small scales were fragile and not suitable for combat and the amount of work involved meant they were very expensive. It may indicate that Larry is in the Haffaton's equivilant of KISS. It may also indicate that he shouldn't be trusted. Of course, this is just random speculation.