If somewhat less of the rise in cases was Omicron, then likely some more was Delta.
Delta might be completing its natural wave, with Omicron running concurrently, rather than one displacing the other. In addition to,, rather than instead of.
let’s hope they don’t get too cozy. Severity of Delta and infectivity of O would not be good for the deer or the lions, tigers and bears. If it happens it’ll possibly be enabled by Delta survivors being succeptible to Omi, as noted in a Sun article a few days ago:
South African experts have reported patients who were infected with Delta are more likely to be re-infected with Omicron, Dr Hopkins said.
https://www.the-sun.com/health/4269064/dual-infection-omicron-and-delta-risk/#:~:text=THERE%20is%20a%20very%20real%20risk%20of%20getting,both%20Omicron%20and%20Delta%2C%20an%20expert%20has%20warned