"Best Coast has and always will be Bobb [Bruno] and I. No matter who has joined the band on tour, whatever lineup ensues, the band is simply the two of us. That said, these past two years have been full of nothing but the greatest of memorable adventures and I am so grateful that my friend Ali was a part of them when we were on tour."

So it seems that Koehler was never thought of as being an "official" member of the band in the first place. But it still doesn’t explain why they would want to go without her services.

Ali had been Best Coast's drummer since the July 2010 release of the band’s debut album 'Crazy For You'.