Wait, is everyone just checking the conductor fill tables and ignoring the whole tap rule thing? I see guys mix that up all the time where they think you can't double up grounds or neutrals in certain boxes, but that's not actually a blanket rule in any recent NEC. It's more about the specific situation, like with equipment grounding conductors in some metal boxes. The code gets read wrong because people hear something once and just repeat it without looking up the actual section.