I agree, it's better to wait until summer to pick up your ideal choice, as January is purely a reactive window, but I definately felt that we lost some momentum by not at least bringing one more player for Rangnick, considering most of the squad are struggling to adapt. I also would disagree with Zakaria being unsuited. We've looked the best when he's used a dm when Matić has played (i know not same type) but he can't handle more than 30 mins unfortunately. I think if Rangnick had a fit dm the team would go up another level quickly.
Wasn't it meant to be different with Rangnick though? Because Rangnick is going to be involved in at least our mid term future? Weren't we lead to believe that he was coming in to help facilitate the new managers arrival. To begin the long tactical adaptation process, & also assess the squad 6 months in advance, so the new manager doesn't have to waste a season assessing them himself?