We still don't know how sound Spina is, when defending. Ofc, he had a great match against Atl. and I really rate him high, but untill we see more defending from him, we can't say for sure if he should bench AS. I trust Max, especially considering defense/tactics - if Spina was good enough to bench AS, we would have already seen that.
I still rate AS as best of our RBs/LBs. And I also can't really see who we could sign that would be better than him?
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All in all - the whole time I was thinking why AS is playing shit - could it be that he didn't have a real challenge eg. a teammate who he would compete with for the first 11?
I'd be very happy with Spina and AS trying to outperform each other, and I think that would be very healthy for both of them.