Almost every player will have a contract with an agent, but that will not stop middlemen from trying to broker moves.
几乎每位球员与经纪人都签有合同，但这并不妨碍经纪人插手转会。
2
The API documentation is only urging caution because by setting cleanstart to true, the broker is being asked to violate the contract for assured delivery of QoS 1 and 2 messages.