D1 is the only time we can force everyone to claim their draft order and expect to be able to force them to be truthful, becuase after that we start losing players, and their answers become lost to the game. Not knowing all the answers means we can't re-evaluate the algorithm mcmc used to confirm everyone's draft position. The other upside of doing this now is that we have 13 slots and 13 players, meaning that there's zero uncertianty about whether to expect a given draft position to be present in the game.
Zero uncertainty about things is nice, but this is Mafia, so I think there are better tradeoffs that get more information into the game, because we're steeped in uncertainty anyway. Also, in later days, scums can take a gamble on claiming slots they think belonged to dead players, and we've seen that go wrong for them in the past, so that temptation might be a good reason to postpone the claim.
The obvious major downside of doing a draft claim now is that we out the people most likely to be powerful PRs, but it's not symmetric: scum can hide their PRs by claiming each other's slots to a certain extent, especially if they're organised enough to have swapped their critical question info in their QT N0. If faust is scum, they may well have done that, for example.
The draft claim is kind of a nice thing for scum to push early, because it sounds liek it has merit on the surface of it, probably enough that a low-placed VT might come out in support. The people most likely to be violently against it are the high-placed PRs, because they realise they're going to be outed without a chance to contribute to the game. So here's me being verbosely against in a self-aware style... hopefull that'll confuse the scums a bit :-)