There is a section here
showing video's for 3 methods for doing 'small diameter circular' knitting. DPN, Magic loop and 2 circulars.
To make decreases for rib easier and more attractive the spiral decreases are good.
Place a marker before each decrease on first decrease round. (Its usually 8 per round) then on subsequent decrease rounds work them after each marker. it shifts the ribs over 1 st at a time and creates a tidy spiral effect. You don't need to worry about how to keep the rib sequence going.
This pattern MarsanCap
shows it clearly with 4 lines but you will get a similar effect with the usual 6 or 8 dec lines.