For almost every manager for as long as I can remember, the biggest issue has been no Plan B. They've been about as effective as expected with the tools they have when everyone was fit and the opposing manager's strategy was as expected too.
When players were out, or underperforming, or opposition tactics were a surprise- we were fucked. No Plan B.
Enter Carlo Ancelotti.
Plan A, Plan B, Plan C, Plan D - all the way through to Z. And this mf has discovered new letters in the alphabet no-one else knows about!
Improvise, Adapt, Overcome.
Carlo is Special Forces, no doubt.