Wouldn't it be more of a Ishii work, though? Koike's responsible for much of the directing and visual style, but he's not the one writing the story, the dialogue, the whateva.. What's so restrained about Redline?
The overall direction and visual style in Redline is more... static and "movie-like" than the ultra-stylized, hyperactive anime-like scene composition and flow he used in both Trava and the Redline pilot.
Just watch the Redline pilot, it really has a really different vibe overall: http://www.youtube.com/watch?v=djk2AsbDa6w