Anderson is an entirely different fighter. He isn't elusive like Machida is. (He is elusive but he uses a lot more head movement where Machida comes in and out a lot more), JBJ had a huge reach advantage compounded with the fact that he has a very very good wrestling base. And Bisping has much better TDD than Silva has.
I see your points but IMO if Anderson was fighting at LHW he would be just as elusive as Machida with is speed. Also his TDD might not be quite as good as Bisping's but it's not far behind. Remember Anderson had a broken rib going into the 1st Sonnen fight and he looked worse then we have ever seen him. Not the same guy we saw before and after that fight.
I'm not saying Rashad couldn't get some take downs. I just think eventually he gets caught with one of those fast, accurate punches. Especially if it's a 5 round fight.