Just realized that, depending on your settings, you might not be able to see my comment, so here it is:
Back in my band days, a four-piece band was lead guitar, bass, drums, and keys OR rhythm guitarist. If you had a lead singer that didn't play an instrument, that was fine, too. But if you had BOTH keys and rhythm guitar, they couldn't both be playing chords at the same time all the time - one would have to lay out or lay back or play something else. The rhythm guitar could play arpeggios or harmonize the lead (Allman style) or the keys could stick to arpeggios or "trumpet stabs" or something that would not step all over the rhythm guitar's chords.
If you added a horn (I was mostly a rock sax player), the horn would need to negotiate for "space" with the lead. Groups like Three Dog Night, Chicago, and BS&T could get away with having 6-11 pieces because the keys and rhythm guitar were careful never to compete for the same space, and the horns never competed with the lead guitar for the same space.
An exception might be certain ska bands, in which EVERY instrument is competing for the same space at the same time, to create a homophony that is almost unique to that genre. But, sadly, most of you aren't playing ska.
This is an oversimplification of what Danny is trying to say, but hopefully it will help you sort out some of the most basic problems he is addressing.