Kayn not available in Blood Moon

In the previous Blood Moon, a Rioter commented on a comment saying that Kayn would be included in the next Blood Moon. Is this intentional that he is not available, or is it simply because all of the RGM developers are currently working on One For All. Anyways is Blood Moon going to be released to the live or is it going to just be a delay of RGMs for OFA
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