Yes, and it was clear here that Ramirez didn't fit Pochettino's tactical setup. He needed space on the ball to show his range of passing and vision, Pochettino needed him to be mobile and aggressive to shut the opposition down from their own defensive line, keeping them (and therefore us) tight up the pitch leaving space in the final third at a relative premium.
I believe Koeman plays a game more akin to Adkins open attacking principles, the same type of setup that suited Gaston when he first joined us. Fingers crossed he can make the most of it.