Just to reiterate, a .361 “slumping” May OBP is very good. In fact, the only guys with a better OBP on the entire team are Goldy and Gorman. It is not like there is another better leadoff option being passed over. Nootbaar is not a star, but he is doing what is asked of him. As noted, there are others performing far below par. So why continually focus on a stat that is not fully indicative, ignoring explanations as to why, other than to tweak other posters, perhaps?
Goldschmidt has always been notoriously streaky. He has one bad month every season. The good news is that Arenado is out of his slump and Gorman continues to produce. And the team is winning more often than not.
I am hopeful for Mercado, but realistic. 11 plate appearances are not much. He has a long MLB track record (over 950 PAs) so this is around where he may level off to – .240 BA, sub .300 OBP, sub .700 OPS. But as noted, ride him while hot.