Understanding how the new ranking system works (New Player)

Hi, So im returning after roughly 3 years of not playing. Decided to do some QP then jump into ranked. During my placements I went 6W/2L and my last 3 games were vs G2-G4. However I placed into Iron 2 I am not quite sure how this new ranking system works but I feel like that is a really delayed start with what im pairing vs. Does the new ranking system do catch up if your MMR stays high enough kinda like the old system?
Best New

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