Completing his training and making him a Jedi are not quite the same thing, really. QGJ says that Maul was 'highly skilled in the Jedi arts' but that doesn't make Maul a Jedi- they just use the term 'Jedi training' to mean 'Force training' presumably because the two are synonomous.
I appreciate that GL says that but the evidence rather points otherwise, doesn't it? That Anakin is obviously Vader being the most important part of it.