If we didn't bring 10k it was at the very least 7-8k
No.
You're dreaming, I was at the game yesterday. Roosters had maybe 2 full bays in the whole stadium yesterday. Given that there was still a few of their supporters were scattered around the stadium 2 and 1/2 to maybe 3 full bays = about 3-4K of Supporters all up.
If they brought in 7-10K then they would have had a fair chunk of the Eastern stand and that wasnt the case at all.
The only time the Roosters brought 10-15K of their supporters to ANZ was for the final game of 2013 where they played for the minor premiership.