Not a fan of signing Diego Costa, but disagree with these out of context remark.
Diego Costa asset as CF is not all about goal. He occupies and riles up opponents defenders all game, thus bringing his teammates into play. Great hold up play. With him in a team, the manager can be afforded with and extra attacker in the team, as he can defend from up front, and help with defending set piece.
If only looking at goal, then Juventus was stupid to spend that much for Morata with similar goal return for Atletico. Simeone Atletico forwards ain't always scoring in load. And more importantly by minutes play, they forwards get rotated a lot. At times, it looks like Diego Costa got played to do defensive work, especially in set piece. Simeone wants more bodies in attack, but wouldn't give up that defensive ability.
He may be past it now, but the true intention is freeing up the high wage, so they can reinvest. They're interested in Milik. This is the signing we should rival them.