One thing the Team -1 version makes very clear is that the special effects shots were considerably grainier than the rest. With that in mind, it seems to me that any despecializations should err towards the side of leaving grain in, rather than removing it for the sake of consistency with the Bluray. With such a good record of the grain levels from shot to shot now available, cleaning them up too much is going to make scrubbed shots feel inauthentic.
I'm not suggesting that it should be left 'as is' from the -1 source—coming from a release print with several generations of duplication, the grain level there is of course going to be higher than it would be if they'd been taken from the same source as the Bluray material, and to jump from pristine to heavy grain and back wouldn't look right. But for the sake of authenticity, we should still be able to see a significant increase in grain level on any shot that has a blending of elements. In light of the "overly-DNR'd" remark earlier, I guess what I'm saying is be careful not to overdo it.
To maintain the appearance of an optically-assembled film, I would go a step further and suggest that any shots which were redone for the SE and retained for Despecialized, such as digitally recomposited wipes and so forth, have a layer of grain added over them, as well. That way, even though they are not actually sourced from the original version, they will appear as if they were. Otherwise, their sharpness and lack of grain will cause them to stand out as looking 'too good' against all the 35mm material that has been put back into the movie. Every shot with opticals, even the wipes, should appear softer and grainer than the rest, but if only some of them do, it will feel weirdly inconsistent.
Anyway, something to keep in mind. I must say I'm very excited to see how this is going to turn out, now that the all the GOUT inserts can finally be replaced! I eagerly await being able to see the other two films in a similar state of excellence, as well. Keep up the awesome work. ;)