Does every rock go through the complete rock cycle, from igneous rock to sedimentary rock to metamorphic rock and back to igneous rock, each time around?
Some igneous rocks are eroded and turned directly to sedimentary rocks.
Some sedimentary layers have ended up on the continental plates. These sedimentary layers have remained sedimentary layers without going through the rock cycle.
Most sedimentary layers are pushed under the crust where they undergo heat and pressure and are transformed into metaphoric rocks before being melted and turned into igneous rocks. This is a complete rocks cycle, but not all rocks go though this process.