Juris Doctor ( JD ) is the American designation for graduate law degrees, being notational replacement for the English Doctor of Jurisprudence. JD is not a court designation. Many people take JDs with no intention of practicing before any court. JDs need not join the American Bar Association and practicing JDs are not required to be members. They can all take the appellation Esq. by custom, simply because they have. There is no particular status acquired or designated in America.
Esquire ( Esq ) is an informal British appellation ( from a French custom ) with wide usage as a general show of respect. At highest, by anyone holding an Office of Trust under the Crown, including Justice of the Peace, Barristers as distinguished from Solicitors ( Esquires by Office) and Army ranks above Captain. Been used in a lot of ways over a lot of centuries. Benjamin Franklin was addressed as Esq. for his scientific contributions long before his Honorary Scottish Doctorate of Law.
The whole BAR/ESQ red herring thing seems to have really taken off in the late 1990's. Shawn Talbot Rice was big on spreading this. ( highly suspected as a confidential informant and Fed operative because people around him went down while he didn't ) Rice was recently imprisoned for money laundering and related shenanigans.
The Constitution is a Trust : http://www.The-Legacy.Info