There is the general rule of CM vs stall and OTR vs offense but the other reason I've seen that CM rank went down is the popularity of Sub CM Jirachi in rain. Not only does it counter Reun fairly well, it also arguably outclasses it doing a good job against stall itself while providing your team a Steel. Reun's bulk would be much more handy without rain because that also removes things like Specs Keldeo / Tornadus / even Toed that can still overwhelm it after a Calm Mind, IMO even if Giratina / Lugia dropped / Deo-D got banned or some other scenario happened where stall gains the edge OTR would still likely be the more useful overall set as long as rain Jirachi is out there.
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