I also doubt that Tyrannosaur hatchlings, had fuzzy feather-like
structures. My reasoning is:
1. The integument that shows that adults didnt have any feathers or fuzz.
2. All current modern analogs that can be used for models. Either have
hair, no hair, fuzz or no feathers at birth.
3. In present day situations there is no animal that loses it fur or
feathers as it grows. Unless you count it getting some sort of mite or
disease that causes it(feather or fur loss).
Also, with feathers, the animal would have to be able to preen daily, and
be able be flexible enough to clean, delouse and keep there feathers oiled
on a daily basis. Small birds area able to use there feet to scratch and
are able to move there head around to clean as well. Also the
Struthioniformes, use use there long necks to get at the hard to reach
places, were they cant reach with their feet. Though not positive if they
even use there feet for preening either.
So the small maniraptorians were probally able to preen themself easier,
with long forelimbs, a long flexable neck. Where as the larger
Tyrannaosaurs, Allosaurs, etc. probally werent flexable enough to get every
single part of their feathered body. And if the larger ceolurosaurs had
feathers, they would probally have very few in a small patch around the
head neck.(my assumtions if they had any)