That timeline doesn't make it any less suspicious. Whether he's taking the drug early season, mid season, or at the end, they all have benefits.
Neither if more likely than the other because we've heard nothing about why the suspension was reduced. All the protocol in the world can't remove human error, and that assuming it was even human error and not an issue with the protocol itself. If he's masking, it'd be in his best interest not to reveal that the suspension was reduced due to a technical issue. It also wouldn't jive with the explanation he gave for the drug use, which lets be honest isn't the most sound or convincing story.
This was in response to people upset that he screwed the Twins when they were on the cusp of the playoffs. That just isn't true based on timeline.