Hi Kyle, that's the current season we're watching in the US, sounds like you are about 1/2 the season behind us, as our finale is next week.
That's Neal, and if I remember quickly, he had immunity that week and so could not be voted off. Therefore, by gaining a huge amount of water weight that week, he would post a higher number than normal, KNOWING that he would quickly lose all that (within 24-48 hrs) plus MORE by the next weigh-in. So in effect, he would lose all those 17 lbs plus probably 8-10 more, which was his standard loss. What he basically did was guarantee himself of being the biggest loser at the next weigh in.
Does that make sense?