There are two separate things: the way an offensive system is delivered to players and the capacity that those players have to implement the system.
You can have a really good system, but if you aren't accurate to deliver the whole thing to your players, that won't work.
Also, you can have a good system and a good way to deliver it to players, but if they fail to execute the system, that won't work either.
I think that's the key in 2010 success, an OC that was able to step up and take care of his duties, create a system and fight for a good way to deliver. That didn't happened in 2009 or 2011.
Cassel isn't the best or near that, but he is available, the true leader of his team and has shown that he can drive a Ferrari, even if he isn't Michael Schumacher.
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