I think he was just a bit eager. After some game time under his belt and a feel for things I doubt we'll see him snapping at heels like that. I reckon he was playing a bit to the world reknowned physicality of the premier league.
Dio wasn't playing at RWB, he was just playing RW and tracking back, presumably because Harry isn't a natural right back. Even Abel was heading back into our half and helping out.
That would mean Clucas was playing CM, right? Even though he was tracking Smith. Which would also imply he was playing LWB by your logic. So was Robertson also playing CB?
Clucas was playing left wing back. Whatever anyone says, I'm going to keep insisting that he was, so you might as well just accept it. So there.
I think it's good that a bunch of you are having this debate and not agreeing. Maybe Eddie Howe was thinking "I don't have a ****ing clue what their formation is" and that's why we won today!