Just a peripheral thought. Didn't someone say that when Rob first arrived, before the SW spotted the potential of the Rob/Hel relationship, Rob was meant to be some sort of - charming but a bit caddish - replacement for Brian?
So, given he's gone down another path, do you think they now have Toby lined up to be Brian jnr.? Symbolic start, shagging Brian's dd and annoying him immensely with his juvenile sheep-raddle in the pool behaviour. But, enterprising, confident, womanising. Immature certainly but could mature into something more suave?
Though, I see him and Rex more as flighty Kenton, sensible Dave jnrs, with ages reversed, at the moment.