Original: Even without the use of Checkuser, or with a result of "unrelated", an account that makes the same edits as a different blocked account, has the same linguistic peculiarities and the same general interests may remain blocked under the "quacks like a duck" test.
Simplified: Even without the use of Checkuser, or with a result of "unrelated", an account that makes the same changes as a different blocked account, has the same linguistic peculiarities and the same general interests may remain blocked.