Sorry to bother you at this time, but why is art a terrible thing to implement in the beginning? Wouldn't it help influence the later devs to build upon the game?
I'd say getting the gameplay core loop done should be first priority, make sure it's fun in it's simplest form, then art would be fine to work on. Having a good looking game that feels clunky and unfun is often worse than a simple looking game that is fun to play.
Also if you have amazing art at the first round, but not a lot of content, then anyone who adds content would have to either match your art, or scrap all art assets to make it look consistent. And if they aren't as good of artists as you they are more likely to choose the second option.
Because it's a project that will take 6 days and many devs will touch on the project, I believe that in the beginning everyone can focus on what they enjoy doing the most or do best.
I'm particularly much better at developing mechanics than drawing, so I'd rather pick up a game full of art on the second day, even with broken mechanics, than a game with polished mechanics.