Do all input addresses in a transaction always belong to same user?

Do all input addresses in a transaction always belong to same user?
Eg:
https://blockchain.info/tx/a7df580e6f1c6e0ad9627b77295cafd73836e0d7827116d5237fb6c25b60efbe

Can it be safely assumed that the following addresses belong to the same user.

Code:

18KUnn8L8DhiASGNNJbC5V49MBQTy6uFVu
1BZZEdvuP5qKPLq7wbXcZ6f3zBMbhqzJRg
12XpnNjijxV5sa1xiaD7XE9QudcWKLQhbZ