A+ compared to S+
Alright so i was playing singed in nemesis draft with my friend who was playing thresh, he ended the game getting and S+ i ended the game getting an A+, but the problem here, is that i had 23 kills he had 24 we both had 6 deaths i had 28 assists compared to his 18 i had 19.6k gold he had 17.3k, i had 174 creep score he had 93. But thats not all though, my damage dealt to champions was 20k higher than his(ad thresh btw) physical damage lower magic damage higher obviously more damage dealt by about 50k, more healing done, 24k more damage taken(higher in both categories too),and more turrets destroyed. So what i would like to know is how he managed to get an S+ and i got an A+? If someone can explain this reasoning thanks