From what I understand the situation is this.
DMB had held 4 dates (5/29, 5/30, 5/31 & 6/1) when they first planned the tour. Because all the tour dates were not finalized st the time, it is standard to book block of shows even if you only plan on using 2 or 3 days.
Now if that is true then Phish is not happening.
To further this, I also understand that even though Phish and DMB share Red Light entertainment, RL does not have the authority to transfer dates between bands.
I know everyone knows someone with a rumor but this one is beginning to look like a not gonna happen.
Have no quarrels against this happening. I prefer it.
The reality is so mixed up that my brain almost gave up earlier today discussing with other people.