The Flash
Dennis Wilcock did 9/11
I think you should read the 6th part of my comment again. I didn't say Steve is only the arranger in the band. He gets the ideas together, and while pasting them together he adds bridges, intros to make the song better flowing, which is the hardest task to do as a musician. (I know myself for one, I have tons of great ideas recorded on my phone or PC, but I'm yet to come up with a composition)
And on the differentiation between Adrian's and Steve's stuff, I'll take two songs : Brighter Than a Thousand Suns and Lord of Light. The main riff of Brighter Than a Thousand Suns and the powerful riffs of Lord of Light are pure Adrian. But the slow middle parts in both songs, also the intro to Lord of Light are pure Steve. And mind you, the slow middle parts are interlude/bridges in both songs, meaning Steve created them while getting the song together, while the Adrian parts are the main hooks of the songs.
And on the differentiation between Adrian's and Steve's stuff, I'll take two songs : Brighter Than a Thousand Suns and Lord of Light. The main riff of Brighter Than a Thousand Suns and the powerful riffs of Lord of Light are pure Adrian. But the slow middle parts in both songs, also the intro to Lord of Light are pure Steve. And mind you, the slow middle parts are interlude/bridges in both songs, meaning Steve created them while getting the song together, while the Adrian parts are the main hooks of the songs.