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I was checking deadlines for top 20 schools and found Cornell , UNC and UT Austin have 4 deadlines (2nd round in dec and 3rd round in jan ) compared to rest of the schools with 3 deadlines. I was wondering if there is any difference in applying 2nd vs 3rd round to these 3 schools? i.e. at schools which have 3 deadlines ,almost everyone advises against applying in round 3 as only few seats are left and as such it becomes the most competitive round.However, these 3 schools have 4 deadlines and I am kind of lost. Is it that Round 1st and 4th are similar to 1st and 3rd rounds at schools with 3 rounds and 2nd and 3 rd rounds are like 2nd round at schools with 3 deadlines or if 1st and 2nd rounds at these 3 schools are similar to 1st and 2nd rounds at schools with 3 deadlines and 3rd and 4th rounds are similar to 3rd round ??

Long story short, since 4th round is their last round, will I be at a disadvantage if I choose to apply in 3rd round at these 3 schools versus 2nd round ?