'Did the Cheeky Chicks seem to have a pecking order?'
For several reasons, no, Antique. You see, even though there are tiny methodological drawbacks to feeding/taming a clutch, it's only by doing that that we get lengthy observations -- I mean, months and months at a time.
Before and after Dad, we saw the Cheeky Chicks only long enough to see that they are a clutch, and note minor differences in the physical appearance and behaviours. Recall that they came; scored their wheat; preened a bit; and drifted off. And they were on the defensive, sorta huddled in a group -- clutch -- as they did those things. But it's when they were 'on their own' that you'd get good observations of their power plays among each other.
[Undersized Emu and Sandy are here, having a bit of wheat over on the edge of the clearing. Sandy hasn't quite figured out the wheat yet, but they've been a pair for some days now, although drifting off for periods and even overnight.]