Groucho
Greg Davis (50)
Plenty of players have been moved around position to position, AAC (Adam Ashley-Cooper) notably. Shep will never get a run at 13 provincially because he is too good at 15 but in terms of skill set I'd assume he'd be an asset in the side. Some players take to new positions like a duck to water and arguably back three would set you up nicely to pick defensive structures. This whole article is about how bare the cupboard is at 13!
And Deans has such a wonderful track record playing 15s at 13, as well.