I think you dont have a clear understanding of how loot works. Getting top score and A+ means you have a slightly better chance of getting rare items than A scores. A scores have a slightly better chance than Bs, and Bs slightly better than Cs.
Anyone can get rare items, and in fact i would expect that most of the time a lower player will get a rare item and the A+ would not get one. The lower players get the rolls for 29 players while A+ only gets rolls for 1.