I've created a Mastery Paths module that includes only differentiated paths. It's working, but the flow is stunted by the lack of buttons once students complete the associated assignment or content page. My current workaround is to include explicit information in the Mastery Path assignments about scores and how students can review pages or resubmit work or move onto the next item based on scores. I would love to see Mastery Paths include differentiated path "next" buttons. The flow is super clunky. However, I am happy to report that the paths are working as designed!