Using Sorting Numbers to Generate Breakup Email Recipients - Help Needed!

Hey team! Trying to do something and wondering if you'd be able to help me figure it out... So thanks to Arturo's helpful "Filter and show only 1 lead per company" Loom, I have all my leads from the same company assigned to a Sorting Number. Now I'm trying to do Eric Nowoslawski's Breakup Email technique, where you say, "Should I reach out to {their colleague} instead?" I'd love to use another lead from the same company in my list to do that. My thinking was that if there are multiple leads per company, then I could take that lead's Sorting Number, add or subtract 1 to it, and then pull the name of their colleague that has that new Sorting Number. (i.e. so if a lead has a Sorting Number of 1, then I'd pull the name of their colleague from the same domain that has a Sorting Number of 2). This seems like it should be fairly simple to figure out...but I can't quite figure out how to do it. Do you Clay Wizards have an idea of how I can pull this off? Thank you so much 🙏