Good gods, just how good is an Azir to get an S- rank?

This is a solid Azir game, i was even complimented after the match with the following words "That was a 3 man team, Azir and his two sand solders..." If this is only an A+ performance. I truly do not understand what else I can do to make it better. Any pointers? 16\2\10 with a CS of 139 @29 min. Also took 2 towers, assisted 3 others, had largest killing spree (14) and largest multi kill ( 3 ). Is it because i didn't penta?