I second the idea of dedicated lines. All of them. Simply because on the off chance a pipe springs a leak, that culprit could be more easily troubleshot and then isolated from the circulation system with a plug in the pool and a valve at the equipment pad. This would allow the pool to continue to be operational without much risk until the leak could be fixed.
I'm a big believer in Murphys law. I even went so far as specified a 2nd skimmer and an extra return line for "just in case". If the skimmer and/ or a return line springs a leak for whatever reason, I can isolate it and really, wouldn't have to fix it if I didn't want to. Little more costly up front, but way less expensive and problematic than digging up concrete to fix a leak. But that's just me. I'm jittery about even the remotest possibility of a plumbing line leak under my patio. However I'm also a big believer in "whatever floats your boat" so I don't necessarily recommend what I did to anyone else.