Gini was 30, had 2, possible 3 very good years in him. He is a more robust player than Hendo and still the club thought he wasn't worth what he thought he was. They probably let Gini go with this very scenario in mind, Henderson, Virgil, Salah and others will approaching ages where their best days are behind them. Arsenal let Ozil, Sanchez and Aubameyang told them over a barrel, FSG and Klopp won't allow that. Captain or not he will be offered an extension on terms the club feel suits his role, Henderson will no doubt feel it isn't fair and they will probably meet somewhere in the middle. If they can't he will move on as a 33 year old like hundreds of players before him. Next stop would probably be Sunderland or America, it won't be to a top club.