I think that's short-sighted. The reason is, s1mple uses the AWP more than ZywOo, on T-side. It's not advisable to be a "permanent entry" with AWP, because then you have to adjust aim and hit the 1st shot. If you miss, 6500-7000 dollars of total investment is gone. Even if you kill a player, you'd be traded, and the loss is more on your side. Thus, not worth it. AWPers do indeed entry, when the spawn is favourable (Like Long spawn on D2), or if it's a specific strat, that requires the AWPer to go 1st. Otherwise, primary riflers are the permanent entries. Now, why s1mple uses the AWP more than Zywoo? Because Navi has no other decent option for a consistent AWPer. Only other option is flamie and he is crap. Navi doesn't have a Shox/Nivera, who can AWP relatively decently.
On CT side, both of them AWP equally. But s1mple is the constant CT rotator (unlike an anchor like Zywoo), keeps moving between A and B, depending on enemy info, and is usually the one to take 1st contact with enemies, and get kills. Taking contact against aggressive T's, is tactically advantageous for an AWPer. That's why his CT side rating is high.