The three loaves represented 3 people, he turns them around and they're actually half a loaf. The 2nd loaf, which committed a serious sin was likened to dipping it in mud. For it to become clean, he cut off the bad bit and threw it into the bin, leaving a quarter of half a loaf. I guess that means that loaf has three chances left.
The third loaf was 'grieving the HS' and he represented this by adding more garlic powder over it and could be removed by dusting it off or 'readjusted thinking'. This garlic powder had been added to all three loaves and represented imperfection, if the additional powder could be dusted off from the third loaf, couldn't the original dusting of imperfection on all three loaves also be removed by the same method?
The thing is that the whole discussion was about three groups of sin. As imperfect humans, every one of us are going to commit, time and time again, the third type of sins, that is grievance against the HS.
By getting JWs used to accepting such stupid made up examples that make little sense, it makes it easier for them to interpret biblical parables into nonsense where the average JW just accepts what they say without thinking, such as the FDS.