The new Ranked draft pick.

Lately me and my cousin have been queuing up for Ranked games as bot lane (me) and supp (him) however we cant just chose bot lane primary and supp secondary and vice versa because we "need more variety". The reason we queue together is because we want to lane together because we can communicate easily. However, when we get into games, more often than not, I get adc and somebody else gets supp. This needs to be fixed please!