I have absolutely nothing to back this other than my gut feeling; but Cobbo just looks like he could be an absolute weapon, in attack at least, at fullback. Within half a season, and with some confidence, I reckon we’d see it developing too.
I think he is worth a proper shot, just looks to have that awkward style that makes him very hard to handle. I also think his defence and organisation would come with time, as is the case with pretty much every top tier fullback.
IMO, Manu hasn’t shown anywhere near enough at fullback to warrant elite fullback money, which is what $1million a season is. So if that’s what he wants, it’s a pass from me.