I was yelling at the TV when they voted off Shawn instead of Jon too.

Now I wonder... are they (the Outcast) going to be able to choose which tribe the newly returned members go to? As in, are they first going to vote Which Person should go back to Drake, and then have another vote of WhichPerson should go back to Morgan?

The only thing I can think of, is... I think I remember from when Burton got voted off, that he figured out that his buddy Shawn had voted against him (If I'm totally wrong about this, let me know!). If Burton got sent back to Drake, and Shawn was still around, that might have caused some (more) tension within the tribe. Maybe they got rid of Shawn to avoid that (because they seem quite certain Burton is coming back) and figured that at least everyone hates Jon, and he'll probably be voted out soon enough without further splintering the tribe?

(I put too much thought into this)

I think it's interesting though that the Outcast stayed on a relatively similar diet once they returned to the boat, though... I heard an interview with Burton the week after his Episode of Doom aired, and they were asking him all sorts of questions about "So, what was the first thing you ate after you were voted off" etc. He was really evasive about it... and know I know why!