Reminds me of one of Dixon's new dinosaurs, a theropod that mimicked its (adult) ornithopod prey. I haven't even read All Yesterdays yet, but I already have some very speculative ideas I'd like to draw inspired by it.
"Troodon formosus playing cuckoo to the detriment (and future disembowelment) of its Ordroremus bunkmates?"
Actually, I think they're generic species. It would't make sense for them to be Troodon & Orodromeus, given the evidence (See the Horner quote).
Quoting Horner ( [link] ): "Data from Egg Mountain and Egg Island now provide extensive evidence to hypothesize the nesting behaviors of Troodon and the paleoecology of its nesting ground. The animals nested in colonies, used used the nesting ground on at least three different occasions, constructed nests with rimmed borders, arranged their eggs in neat, circular clutches, brooded their eggs by direct body contact, and, apparently brought the carcasses of Orodromeus to the nesting area for their hatchlings to feed on. The hatchlings left their respective nests, but may have stayed in the nesting area for a short period of time before following the adults out of the nesting ground."