Plaguies DID create anakin. There is no doubt about it.
Look at the look on Palpatine's face as he says, "And you, young Skywalker, we will look forward to your career with great interest".
And the look on his face as he sais "He could even influence the midi-chlorians, to create......life."
Plagueis, influenced the Midi-Chlorians, to create anakin.
Then, as Palpatine said he "Taught his apprentice, everything he knew"
Now, Palpatine knew of his plan as well. He wanted to be the one training anakin as a sith, so he Killed Plagueis in his sleep. That's why he looks so happy when anakin arrives on coruscant.
It makes too much sense, to be wrong.