I think Adrian is the one among them who has developed the most technically since the early days, But creatively, I think he was just as good on Somewhere in Time. But I understand your point and agree to some extent.
Guitars are always L-center-R but on different songs Jan and H switch right and center positions... like Shadows Of The ValleyProduction of solos is unusual. Similar to live recordings, most of Dave's are in the left channel & Adrian's at about the 10:00 or 11:00 position (between far left & center)...but almost all of Janick's are in the center channel. Don't know why Kevin did not complete the live feeling (which it seems he was trying to do with Dave & Adrian) by putting Janick's in the right channel.