The poor and marginalized have not had equal opportunities and access to resources regardless of color, gender, low-income individuals, prisoners, the disabled, senior citizens, and many more. Are disabled people being “left behind” or simply lagging? Increased attention to equity, inclusion, and social cohesion and their roles in the realization of the Sustainable Development Goals has also brought attention to addressing intersectional and structural inequalities, notably among the most marginalized, excluded, and vulnerable. In this respect, it is crucial to differentiate the intersectionality of special groups of disabled people, in particular, to avoid essentializing “the poor,” “the marginalized,” or “the vulnerable” and to focus on micro-populations of groups that may experience complex forms of marginalization and exclusion due to intersecting identities. Small is beautiful, and small differences among small groups of people with disabilities matter. The implementation of the Agenda's call for no one to be left behind has sparked multi-sectoral dialogues to ensure self-determination, empowerment, and the full inclusion of people with disabilities. People with disabilities have themselves denounced that they might be “left behind,” with quality, consultative, and timely data on disability remaining a blind spot. It is estimated that around fifteen percent of the population of the world has some form of impairment. We expect that, in the next round of multi-country poverty assessments, a broad range of time-varying markers of disability will be included, an expectancy in line with the call for more and better data on disability.