It's a tricky one and I'm really not able to speak authoritatively.

My understanding is that when you are talking digital sources (such as the CAPS animated films) being transferred to modern film stock, there is little to no need for the animators to 'compensate' in color or style like they did in early films.

So while HDTV and old film prints may have grain, there has been no need for Disney to actually scrub or clean them for BD since the masters do not have grain. As a result the film transfers in all likelihood look nearly identical to what the animators see on their computers.

So while I do like grain where appropriate, these films haven't been altered when being transferring digital to digital (like CG animated films).

As far as HDTV prints having grain, they versions created for HDTV broadcast. Since HDTV existed before Blu-ray, they are usually struck from film masters because it's cheaper and hey it's just TV.