Forget the names in the order. Tired and boring names! Though I should ideally be congratulating two, and politeness invites it, this post is reserved for Mr. Prateek Chadha! Your boss has made some fine suggestions. I am sure I can see a bit of you in there.
My Vote: “If the successor Chief Justice of India is not one of the 4 seniormost puisne Judges, he would be made a part of the Collegium, as he should have a hand in the selection of Judges who will function during his term as a Chief Justice of India.”
Hmm. The Hand of God. If all is orderly, I do not see any successor Chief Justice not being “one of the 4 seniormost puisne Judges” in the long chain of events that are to lead from Thakur J. to Ramana J. in April, 2021.