This plot makes my head hurt, so I'm probably all wrong, but this is what I guessed:
Who pushed Hoban? Anshu
When did he fall? 6:00
Where on the ship did he fall? aftdeck
Where is Hoban now? I22
Do you like Hoban's hat? yes, it's very stylish
Anshu says he heard Hoban arguing with "someone" at the aft deck at 5am. The comic shows this is still during the storm, presumably before Anshu was ordered belowdeck to help fix the leak (as Linae says this is just before the storm ended). He asks Bonju if he knows what's up, and Bonju doesn't. Bonju says that at some point ("an hour later" after he had noticed Hoban being grumpy over by the starboard railing), he speaks to Hoban who reiterates that Linae had said he was bad luck and upset him.
So which came first? The second argument at 5am, or Bonju asking Hoban what was wrong? I'd assume the latter, because Anshu says that when he asked, Bonju says he has no idea why Hoban is so upset...but he then learns what made him so mad (though he could have lied to Anshu as well).
I'd assume that, if Anshu heard Hoban arguing with someone, he would have been able to recognize if it Linae's voice...her being the only female on the ship. But he could easily be covering up for a friend.
In fact, any of them could be lying...or they could ALL be lying and we just don't know, because everything is too vague and there are so many inconsistencies. *tears out hair*
I also don't see how Hoban could "be" anywhere other than a land mass, because unless he sank like a stone, straight to the bottom of the ocean, and then stayed there, the currents would have carried him toward land anyway...but the grid doesn't show anything other than a line and a bunch of red x's, which really could be anything. But I picked I22 ...well, mostly because a bunch of other people did.
But it's also the last x on the grid, so it would make sense that Hoban fell there and the need to keep track of him/the ship/whatever those x's are was now a moot point.
I think.
*brain explodes*