That doesn't make sense to me. For the general customer, the Pencil 2 will require an edge connector on the Mini 5 and with the Mini already thinner than the Pencil 2, it will be awkward to attach and transport. Since you're talking about a "Pro", that includes pogo pins for a keyboard cover/folio. That doesn't seem too practical for a device so small. For vertical market customers, it makes more sense for Apple to provide support for something like the Logitech Crayon.