Yes, Merrill had a crazy good August himself - and both are raking into September....Merrill has had ok months early (just under 0.700 OPS), then an awesome June, dip back towards a 0.700 OPS in July, and an awesome August (0.969 OPS). Chourio's season-long OPS was sub 0.600 at the end of May, since then he's been OPS-ing ~0.900, ~0.875, ~0.925, and now ~1.4 from June into September.
The fact Chourio is within 0.1 WAR of Merrill despite his April/May early season scuffles and roughly 2.5-weeks fewer ABs is crazy, because Merrill really hasn't had an extended slump period in his rookie season. Merrill also has roughly 50 more ABs to add to his counting stats since Chourio's early season issues led to him being a part time player for a couple months in May/June while he was turning things around.
Chourio is getting intentionally walked in plenty of late-game situations now....in order for pitchers to face veteran middle of the order hitters instead. Even though it won't apply to him next year anymore, there should be a MLB rule change that if you aren't yet of legal drinking age stateside, you can't be intentionally walked.