Will was actually behind the ball so had to have high speed up to track across on the scrum play (pushing hard, sideline to sideline), he then had to dodge Taylan May coming through and Doueihi's momentum got halted by Hiroti which meant Kennedy, who was pushing hard sideways, overshot. Throwing a random arm out was all he could do.
Sifa coming in was the issue there.
The harsh truth is, Kennedy is not there to be even an okay tackler.
He is, by design, a significantly below NRL standard tackler. By 'by design' I mean he would spend a lot of time at training practicing other things instead of tackling.
In NRL games he has made 784 out of 1064 tackles (74%)
As an extreme example Blayke Brailey, who debuted the same season, has made more tackles than Kennedy's career total on three separate seasons. His career total is 6782 out of 7213 (94%).
So far this season it is 337 to 42 made, or 347 to 58 attempted. So far this season Blayke is 9 tackles shy of doubling Will's single season career high and we are only 1/3 of the way through, not including finals.
Will is not there to tackle. He has never been there to tackle. In games he is hardly asked to tackle. In training he often doesn't practice tackling.
Sure you can pick out individual times he could have done better, of course you can, often in high speed situations with varied angles or where he has to make decisions, because he gets put in those circumstances a lot when he is asked to tackle. Not saying he can't do better but he just simply isn't ever going to be making a lot of these tackles people complain about.
Keep in mind though, instead of practicing getting better at that, he is likely off working on catching bombs or executing sweep plays.
Kennedy attempts 7.5 tackles per game. Say on average he played 20 games a year from 5 years old to start of this season, that is 23 years, 480 games, a lifetime tackle attempt volume of 3,450. Or as an adult, 1500 tackle attempts.
James Tedesco has a lower tackle efficiency than Will this season. But career he has made 1170 of 1497 (78%), that's the difference of if Kennedy made just 5.5 more tackles per season. Be great if he could make them, be great if he could be more like Teddy in general, especially if paid like Kennedy still.
Jesse Ramien, with about 30 games played more than Will, has made 2346 tackles out of 2665 attempts (88%). He has had 250% the opportunity in game to make tackles, in one of the hardest defensive positions. It is part of his role to have to make those tackles.
This had been a bortGPT production on why expecting fullbacks to simply make a better tackle actually is asking a lot.
Also, had to beat your word count.