Nah you are wrong. Mannering has scored 80+ 3 times this year. Reasons why you were extremely luckt include..
James playing when he should be suspended and scoring two tries.
Aitken scoring well below his average.
Hayne getting injured.
McQueen and Tupou scoring well above their average. (Tupou scored Tedesco average so you were lucky there)
Ethan Lowe has played every minute this year, except this week with only playing 60mins, Josh Jackson with just 58 on field. He's an 80 min player. James only played 43mins. all 3 could have easily got another 20 points each. It's just what happens. You had a period of a 3 or so matches where tolman went beast mode and never went off. Even Smith went off in the last 5 mins which defo cost him 20 points the way he has gone all year