Schiff won’t release the documents, that’s a fact. It does not behoove him to do so.
So, Grennel should release them himself. After all, he’s ‘just’ acting DNI, soon to be replaced by a new DNI. So, Grennel’s last official act should be to put them out there, regardless of how Schiff feels about the matter.
But, Schiff might be just waiting for the new DNI to take office and let the new guy do it. Then, Schiff can claim the release as a political hit job, since it would be Trump’s nominee who assisted in defending Trump in the congressional investigations.
Grenell may be prodding Schiff due to stories of Schiff causing gay males to be murdered during posited drug fueled orgies and their bodies dissolved by muriatic acid. Grenell a gay man might just be a little pissed at Schiff for what are explosive stories barely being contained by the media about Schiff.