@Riot - How does rank in season 6 work?

Are we going to have too different MMR since we now have the regular blind draft pick and now the team builder. Are they going to be separate elo or are the same? If they are the latter, then how does that work exactly? Everyone will want to play team builder instead of normal blind draft pick since it allow them to climb easier. For those that want to do normal blind draft pick, your at a disadvantage unless the two rank modes have different ranking.

If anyone understand this system better, please clarify because it is really confusing me for a while now.