Before revision:  What adds further complexity is the existence of branched pathways and futile consumption of fuel that leads neither to elongation of the nascent protein nor forward stepping of the ribosome on its track.
After revision:  What adds further complexity is the existence of competing pathways leading to distinct cycles, branched pathways in each cycle and futile consumption of fuel that leads neither to elongation of the nascent protein nor forward stepping of the ribosome on its track.