@HappyNJ , that is helpful, but WL comes from RD round. Deferral comes from ED round and is generally not disclosed in that data.
I think one of the hardest decisions that comes from an ED1 deferral is whether to ED2 somewhere else. It MAY improve your odds of acceptance at the second school but you are agreeing to give up a second shot at the ED1 school if ED2 works. In this regard, it would be so so much better to know what that ED1 deferral really meant. If it was “You are a legacy whom we cannot admit so we are letting you down gently on the hope that your parents will still donate”, that is quite different from “you were totally qualified but we see lots like you and we need to see you in the context of the RD pile but you stand a real chance”.
Schools defer students for a lot of reasons, from wanting to encourage future applicants to needing a second look to not irritating alum parents. Unfortunately, the deferral letter doesn’t come with a reason code!