I agree that although it is certain that Mane will leave Liverpool, it is very likely that Klopp will be able to find players who can replace Mane because so far if we look at some of Klopp's purchases of players almost all of them have proven effective, such as the purchase of Thiago, Jota, Luis Diaz and Konate although bought at a price that is not too expensive but under Klopp's guidance they were able to play brilliantly.
I'm sure Klopp will find a better replacement than Mane and also Klopp has the ability to develop strategies for each player to be more agile and able to compete with star players, but nevertheless he must find players who have skills in him before being trained in new strategies by Klopp.