The main fight is between ISKCON and rest of the Sampradayas. there is nothing to do with Puri and Yatra.

The main fight is between the discipline devotees and indiscipline devotees. Discipline devotees can adjust anywhere as like Good people. But Indisciple devotees like ISKCON cant adjust with any other Sampradayas. Because drunkers only can feel heaven in the bars not in the good society. Such like this, ISKCON cant adjust with others.

Last 1000s of year Hindus are following scriptures rules. But their Prabhupad changed the rules for them. Not a single guru is authentic to change the rules. And Hinduism doesnt want outsiders. There was no need to change the rules for foreigners. They (foreigners) are not our father.