DM-1 has been expected to slip to March since late January. Apparently Roscosmos is rather gabby when it comes to ISS/NASA timelines. lol
The SpaceX HIF has plenty of room for boosters in addition to having an FH already integrated on the TEL. With the Arabsat-6A launch, they don't have the added burden of scheduling ISS, so I can see SpaceX trying to go forward with a FH launch while DM-1 waits in the wings. (Then again, it's more likely my own desire to see another FH launch that I'm looking at it through rose colored glasses.)
