Ok,
First off this is a narrative/opinion question not a RAW question (although if RAW puts a requirement other than fr 3 on master, that would be relevant, I didn't spot it in the book and I doubt there's errata to that effect)
So the question boils down to "Did obiwan have the jedi master spec during attack of the clones?"
The era is prequel if that effects your answer
I think obiwan was narratively a knight in attack of the clones, but he had Anakin as a padawan very near knighthood.
Should you have the master (or teacher) spec (not necessarily filled out) before taking a padawan?
Should you have to have a padawan to qualify for master?
Should you have to have trained an padawan to knighthood before taking master?
Does taking the spec mean your a master?
Could you take the master spec and not be a narrative master, and have to get to the bottom of the tree being a master?
Should there be an age requirement, so that a human wunderkind who got knighted at 13 or 14 have to wait until his mid to late 20's before achieving the rank of master?
Edited by EliasWindrider