After a strong start to his Barca career, Aubameyang's form in his new club has declined markedly.
In February and March, former Arsenal captain Pierre-Emerick Aubameyang was doing at Barca could be heard almost everywhere. He scored 9 goals and 1 assist in just 11 games, close to averaging one goal per game.
But things haven't been so smooth since then, with Oba contributing just 2 goals and 0 assists in nine games since April 1.
This coincided with the team's slump in form, during which Barca were eliminated in the Europa League and lost in the league to Cadiz and Vallecano.
Of course, Oba's new club is still in the top four of La Liga and has locked up qualification for next season's Champions League, so there is no need to worry about results.
But some Barca fans are starting to come out of their honeymoon with the new goalscorer, complaining about his repeated missed opportunities and lack of control.
This decline can be said to be inevitable. Arsenal fans know Aubameyang and have watched him play at Arsenal for several years.
We all know he's a top scorer, but it's also clear that he's going through periods that are like sleepwalking in some games.
It's a trade-off, a risk that a big club like Barca can take. As long as you have other offensive options and ways to win games, you can withstand Oba's slump.
It would be a surprise if he had maintained the efficiency of scoring goals in the early days of his time with Barca.
This trough is a normal phenomenon and it won't be long before he can regain the feeling of scoring goals.