Yup, that's exactly my worry.

If the superuser class that has gained hundreds of thousands of Steem power start creating secondary accounts, no one will be able to stop those accounts from also being rocketed to the top, effectively censoring users that the superuser group doesn't spend votes on (which could potentially solely be their own accounts).

Then those users now have double the amount of voting power, and can rocket a third account even faster, and so on and so on.