Graves buffs are nice and boosts his jungle clear and dueling ofc, but not enough to make him s+, he can clear 3:15 solo which is huge, but some bad matchups atm.
no clue if mundo is good or not, so removed him from list, nobody is playing him and his winrate is low in jg so i dont know.
Skarner up a tier, very strong tank, can go bruiser with manamune too.
Lillia is a stronger duelist and better at killing tanks it seems, so better 1v9er maybe, but worse at making picks, will have better read over time but doesnt seem too good still.
RekSai needs more than that
Xin lost 1% winrate, nothing massive considering how strong he was, imo still s+, its the same champ regardless of these nerfs, theres no champion to fit his spot.
Ivern buff is good, S+ in some games.