We have left ourselves short in some areas, but you can't always go from a relegation scrap squad to top 6 in only a couple of windows.
No transfer policy has a 100% success rate even for the legendary managers of the game and it takes time.
But if you look at the disappointing run since December, a lot of it is to do with a specific weakness on the right thats come to the fore the more we've had to rely on Christie. Sort the left back, shift Coyle back accross and hopefully that. Gets resolved.
A highly disproportionate number of goals conceded have come from cut ins on the right. We need to eliminate them to get back the form we were in prior.
... And it looks highly probable if you listen to the noises Baz is making that GK, LB, and another winger are priorities that have already been identified to be addressed this Jan.