We need a natural sub for llorente and Osvaldo can be this for the remainder of the season. It is a loan deal, if he proves to perform well as that sub, then the club can negotiate. I still don't understand it fully, I would have preferred a winger or attacking playmaker of some sort. But Conte obviously wants his 3-5-2 to remain and that is why Osvaldo is joining rather than a winger as first mentioned earlier on.
If the Vucinic and Guarin swap does happen, not sure how inter can mend the relationship between the two clubs after that disgraceful business like behaviour, but maybe Guarin can be that player in an advanced role in midfield and maybe Conte will try something different for a change?