Faried and Sullinger, aside from their rebounding rates, could not be more different from one another as players. Sullinger is skilled on offense - decent midrange shooter, respectable from 3 (for a big man), very good passer - but lacks the physical makeup to finish inside at the pro level. Defensively, he uses his length and BBIQ to not be a complete liability. Faried is all effort and physical makeup on both ends of the floor.
None of this is to say we shouldn't look at Faried, but he's not a "better Sullinger" - he's a completely different brand of big man. Additionally, he would likely be a tricky fit in Stevens' system because of his lack of shooting/passing/general versatility, unless we get better players - namely, better shooters.