So looking at these Missed tackles more closely
Gillett- missed 57 tackles of a total of 526 attempted - 10.8% missed tackle rate
A Kelly- missed 56 tackles of a total of 353 attempted ? 15.8% missed tackle rate
Thurston- missed 49 tackles of a total of 222 attempted - 22.1% missed tackle rate
Sims- missed 47 tackles of a total of 380 attempted ? 12.3% missed tackle rate
and our contribution
Sandow- missed 54 tackles of a total of 226 attempted ? 23.9% missed tackle rate
I think Gillett and Sims can both be given a bit of slack given the total tackles they attempt compared to the number of missed and in a lot of ways Albert Kelly stats are actually pretty good, in both attempted and missed tackle rate.
Thurston is obviously a bit ordinary, but when you can control a game and set up the play like Thurston can then I think you can afford to cover his defensive deficiancies.
If Sandow was as good as Thurston I would say we could excuse his defensive deficiancies, but until Sandow can provide what Thurston does for his team most of the time then I dont think we can have a half who misses close to 25% of the all tackles they attempt.
A look at all the other halves/five-eighth in the NRL the only other player that is anywhere near Thurston and Sandow for missed tackle percentage is Benji Marshall, but even his is lower than both of them.