IACGMOOH in the Q1, they’ve played around with that and it rates the best there.
Does it though? 

Aired Q2 March–April
2023 averaged 820,000 (Consolidated Total TV 7 Days, rounded to the nearest 10,000)
2024 averaged 830,000
Aired Q1 January–February
2025 averaged 750,000
I keep spreadsheets used to measure and compare each reality series that I watch, and I can say with
absoluteness that this is not true. The numbers clearly indicate that the show performed better when it was airing into Q2. In fact, after returning to the Q1 slot this year, the show ended up 10% down on last year's series which, funnily enough, was the show's best numbers in a while.
Survivor is up against MAFS and still managed over 800,000 viewers. Meanwhile, MasterChef is so far averaging 760,000 (down 5% on 2024's 820,000). MasterChef could handily match Survivor's numbers against MAFS. It's probably TEN's only other offering that would still survive against Nine's Q1 juggernaut, which could result in future seasons rating higher than what it is now.
Survivor is about to air in Q3, and I would guess it will match, if not beat, what it currently does and the 2023 season still managed 900,000+ even against MAFS. Who's to say Survivor couldn't reach the 1,000,000 mark even just once when away from MAFS? It was on the increase from 2017 onwards, with the 2019 season averaging 840,000, and in my opinion, that figure could be even greater with the new OzTAM measurement in Q3.
I would argue that when looking at these numbers, it is clear that both MasterChef and Survivor could thrive — and potentially do even better with a schedule change. Survivor has been proven to do well in Q1, but was doing just as well, if not slightly better, when it was airing in Q3. Seasons 1–4 & 6 aired in Q3 away from MAFS and altogether averaged 768,000, whilst
All Stars, which aired in Q1 against MAFS, is the second-lowest rating season at 733,000.
Survivor you could change around, because ratings wise it doesn’t really change…
Thus, this statement is also incorrect...
MasterChef also has a lot of potential gain going up against MAFS and could even do with being cut down to eight weeks as well.
I'm a Celeb could follow and do well, as it has before, in Q2, and
Big Brother could either precede a
Survivor season or be sandwiched between two
Survivor seasons if TEN really wanted to. They could even close the year with
Celebrity Big Brother or some alternate spin-off show. I too used to think MasterChef should be locked into Q2, but this year's ratings do not really do the claim much justice.
Here are some sources where you can verify the data that my attached spreadsheets display: