David Marjanovic wrote:
grubs (forelimbs used to strip bark),
Not recommended for an animal that can climb... about as well as a horse.
eggs (forelimbs used to carry and break open large eggs - and the long legs were used to run away from angry mothers),
Unless the eggs had unrealistically thick shells, I'd rather suggest ordinary long maniraptoriform arms for that job. Several long fingers for grasping, long arms in general for fast snatching.
Oh yes. But then the Morrison Fm preserves termite mounds that are up to 30 m high.