OHH WAIT
So basically you mean that the compression should be on a separate input and drums and percussion shouldn't be compressed and only side chained on master and the rest can be compressed as much as I want? Also about limiting and compression, that's really some new info. I've had an idea that compression amplifies the volume to a certain point, but not how it deals with limiting it.
Viewing post in B.F.T.T. Act 2: Revelations OST jam comments
It depends. Most of the time you'll most likely use a light comporessor in the master chain as a glue effect. So in this case the comporession should be low.
The other thing mentioned is a technic by Andrew Shoeps. There you would use a heavy compressing comporessor as a seperat bus befor the master chain (or as a side chain) without the drums, yes.