Sakho was shit and Klopp has treated the two of them completely differently already.
If anything Sakho example shows how Coutinho is a different case.
Sakho didn't show dissent during a transfer window and nobody were urgently trying to buy him. Coutinho's situation is different. But if he's still at Liverpool after September 1, you can be sure that if he's still acting like a primadonna, he'll get the same treatment. Its actually Coutinho who should be trying to make amends with the club if he stays. Because if he's going to act like a little bitch throughout the whole season anyway, why should Klopp give a shit about his "feelings"?