Crawford is NOT Bill Mueller. It didn't matter who hit in front of Mueller because MUELLER COULDN'T RUN.
If you bottle up Craw behind the slugs and in front of the likes of Lowrie, Drew, and Salty, he's a .300/.355/.450 hitter, 15 HR, 65 RBI, 80 Runs, 25 SB guy.
With Crawford's legs available for use (i.e. the 3 hole), he's a .300/.355/.500 hitter, 15 HR, 85 RBI, 110 Runs, 35-40 SB guy.
There's a massive difference of potential when you put him in the top of the order. Hitting him 6th takes away HIS BIGGEST ASSET