Robertson helped a lot until Seranthony got hurt. Phillies might not even be in the playoffs without that trade. A better reliever would have cost a lot more than Brown.
Of course if Coonrod and Brogdon could have delivered as well as Alvarado has, or if Knebel had worked out (IMO Familia was never going to be good) they wouldn't have needed him in the first place.
I saw Matt W on Twitter wondering if the Phillies may yet bring back Coonrod or even summon Morales from Arizona but for now i would think they'd like to use Thor. Ideally we still never see Nelson or Gibson.