No problem, I acknowledge Hartley is the most likely option, but just trying to be a little creative.
The good form of Stewart makes sending Hooker back when needed more viable. So the third tall role Francis has been playing in the seniors would still be part of his role, but he could potentially cover Darling part time if that was working and rotate with Hooker. The purpose of that is to find a slot for Francis while at least part time continuing with Hooker forward.
While not the most likely scenario, I like to put it out there as a way of trying to get our best, most dynamic players on the park and playing Francis into form and fitness.