Well here is a good place to start. adjective On that definition I would dare to say that neither Jones, or Duran were established in The Heavyweight, or Welterweight ( at the time he fought Leonard ) divisions respectively. Again by that definition I would say that Jones's 6 fights in the 168 division over a period of just less than 2 years does NOT make him established as a S / Middle. He only beat 1 worthy opponent in that division, unless you count the 16 fight relative novice Brannon as someone special.
Settle down, Poxy. You're far too old to be spazzing out on internet forums at this stage in your life. The stats are there on boxrec to view. Duran had more fights above the lightweight limit in the 1970's than he had at the weight. It's as simple as that.