breinejm 
So what is most likely:  Did the web monkeys enter Dan's 1st interview incorrectly (as bitten by a shark), or did they screw up the weeks and we now know Dan gets bitten by a shark in an upcoming episode?
Welcome breinejm!  LOL!  Love your reasoning!  
I watched and rewatched Ep 5 to see if I missed a shark bitten Dan.  Unless one of those dead fish in the RC was a shark and "woke up" for second, Dan did NOT get bitten!  
Also, I replayed the IC over and over to see if he got bit while diving to retrieve the skulls.  
Maybe he did? but the editing cut it out?  I seriously doubt it! 
Ruday