Do you know why does Suganuma steps back every time he completes a technique? Is that an Aikikai "thing?"
I don't know, I didn't even notice that (I'm just a 4th kyu).
I don't think there really are "Aikikai things". There are so many different lineages within aikikai, which can differ just as much as different aikido styles differ.
Perhaps there exist such things as "Aikikai Hombu Dojo things", I don't know. Although our organisation is under aikikai, we are not affiliated with a shihan that teaches at the Hombu Dojo. And I don't know if Suganuma is from the Hombu Dojo.