Brown says racing in an Olympic year after the Games always has its challenges, but they have been allowed for in the buildup.
"Everyone has had quite a long year but we knew this period between Rio and Cozumel would be quite challenging so we have made the effort to go to Florida and prepare in the heat, the conditions will be the biggest challenge this weekend and how people deal with that is going to be crucial.
"Some people physiologically are better in the heat, you can prepare and train but some have more natural advantages in getting rid of the heat build-up, largely due to body shape. Our girls are all looking forward to the race and everyone wants to finish on a positive note."
Meanwhile the quite remarkable Hewitt has been counted amongst the three best in the world on five occasions since 2009 and has never been ranked outside the top six during that amazing 7 years and will be hoping for a strong finish to her campaign to continue that peerless run.
Hewitt is in 5th place heading into Sunday mornings (8am NZT) Grand Final and with a heavier weighting of points on the line in the Grand Final, a strong result might yet see her overtake Jodie Stimpson (GBR) and Katie Zaferes (USA) to earn yet another medal to add to her collection.
Samuels has returned strongly after her long injury layoff and will start on Sunday in 24th place, knowing that a top ten or podium position in Cozumel would propel her up the season ending rankings.
Simone Ackermann comes into the race ranked 52 in the world, looking at the very least for a consistent showing to end the season ranked inside the top fifty in the world.
Ryan Sissons will be the sole Kiwi in the elite men's race at the ITU World Series Grand Final in Mexico this weekend (racing Sunday elite women and Monday elite men NZT) but he won't let that stand in his way of a strong finish to what has been a hectic year.
With the Olympic Games in Rio the obvious key 2016 event for all who qualified, Sissons is looking to reach another peak when he lines up in Cozumel at 8am on Monday morning, knowing that a strong showing might yet deliver a season ending top ten world ranking.
"I wanted to be top ten in the world at the end of the year, I think I am 15th or 16th at the moment with the five others all close to me. I was hoping for a strong race in Edmonton to push me up but I didn't get that. As a result I will count my New Plymouth World Cup in my points - which isn't bad as it was a fourth place and that is not too bad, but if I have a good race here it will help those chances. It does depend on how others ranked close to me perform on Sunday as well though."
Sissons will be the only Kiwi in the men's race, with Tony Dodds making the call to return home to recover from an injury picked up in training. Sissons has also had a few hurdles to overcome since Rio, with illness affecting his ability to train in the days after the Olympic race.
"I lost a couple of weeks of decent training which is pretty annoying and then raced Edmonton on the back of two or three days easy training, which was not ideal. But I have managed to get a reasonable amount of work in since then so am looking at having a solid race. It is tough to know how I am going with the limited time since Edmonton, but I am pretty fit and I have done some reasonable training for what will be a hard race on Sunday here."
Conditions in Cozumel are hot (early 30's) and humid, meaning the race is as much about coping in that environment as it is about racing fast.
"Conditions play a huge part, it is not going to be a fast race, it will be a bit of 'survivor' out there with the hot conditions and that can play into my hands a little, I have raced well in these conditions before. So long as I can hang tough and get through the 10k after all of that, it should be alright so yeah, I am looking forward to it."
Sissons and the rest of the members of the elite squads have arrived from an acclimatization camp in Florida, where they rubbed shoulders with the entire New Zealand team (U23 and Juniors) heading to Cozumel.