Griezmann was one of the failed transfers that Barcelona had ever made, while at Barcelona Griezman did not contribute much, very different from Lewandowski who immediately made a good contribution to Barcelona. Now Barcelona and Atletico Madrid have reached an agreement for the transfer of Griezmann for a value of €20 million + €2 million in variables and the player has agreed to stay permanently at Atletico Madrid.
This is clearly a failure for Barcelona but indeed in a case like this it is actually still very reasonable because there are some players who don't really fit into the new club and are better at the previous club and not only Griezman actually because for example there is Coutinho and a few seasons ago there was Andre Gomez and Malcom.
But indeed in this case Atletico clearly get a big advantage from this.