<p>^OP is asking anyone who already got into their SCEA school to withdraw their RD applications since the folks who got in SCEA are usually the kind that are quite attractive to the other elite schools too and may occupy several admissions on April 1st. </p>
<p>For RD, someone could have applied on September 1st. You are just putting in a preference and so when you applied is irrelevant, the fact you are under consideration is relevant since you may be providing a tough competition to the rest of the pool.</p>