Do you really think it's just an adaptation issue? Because honestly, we're seeing signals that go way beyond the usual "new players need time" thing. Yeah, the turnover was huge, but other clubs have it worse and still manage. The problem is there's a real disconnect between what we bought and what we're actually doing on the pitch - it's less "the guys need to get used to it" than "nobody seems to know what they're supposed to be playing".
The other answers mostly talk about cohesion and integration, and sure, that's part of it. But honestly, after months of competition, if it's still not working, you also have to look at whether the tactical choices actually match the squad we have. Sometimes you see a team with the same players playing completely differently after a change in management - it's not like the guys suddenly changed overnight. Maybe the question here isn't just "it's not working because it needs time" but "we're using these players in a weird way".
Personally I'd say it's both, but not the way the others are saying it. It's more: poor squad construction (players who don't naturally play together) + a game plan that hasn't found its rhythm. And that doesn't get fixed just by waiting another three months.