Only taking credit for the good not the bad.

If one Soldier wins the board during an rating period, this would not be considered an excellence bullet. It might help counter balance the article 15 down the road, but even without that it's not an excellence. You have to see it in 360, as if a leader has 43 troops and one does it over a year... or perhaps he has one and over a three month time period... I dont see excellence there. Perhaps a rewrite to show the competition of mentored Soldier to win "whatever" over 15 others. The person going before the board might have had very little competition, and it was probably required by the CSM or 1SG before the promotion board.
BLUF: a full 360 view should be given on evaluations, and leaders shouldn't have just the good stuff in there. Perhaps their team/section/platoon has a discipline issue, in which the 1SG or rater needs to have written confirmation that the issue existed and was not fixed before the eval and it should reflect, perhaps not with a needs improvement but with a success.

Here is an example for you. I helped a battle buddy study for the promotion board, however she did I would say about 95% of the work with prepping her uniform, studying, and putting mock boards together. She won the NCO board and then passed the promotion board. Her leader not only did not help her at all but also did not show up as her sponsor. So even though he did nothing he could get away with putting the bullet on his NCOER because his Soldier won the board. I know that this isn't always the case but I have seen it a few times. My challenge to us leaders is that if we would take credit for the good things our Soldiers do then we should also take credit for the bad assuming that what bad they did could have been a result of our poor or lack of leadership.

Sure, if you were right there when he committed the action that got him the ART 15 and you didn't do anything to stop it then I am all for that. Now, if your Soldier goes out and robs a store while on leave, why should that reflect negatively on an NCOER of his leader?