The Fall: (Final title unannounced) all by DRG3
"All" is not supported by the evidence. DRGIII said that his novel (singular) would be kicking off The Fall
. That indicates he's only writing the first book in the miniseries. He also says that his novel specifically is a DS9 work, which doesn't suggest that the whole series will be.
I think Turtletrekker actually meant that all three novels listed for DS9 are by DRG III.