I'd concentrate on some of the dubious deals since you always put an emphasis on these and neglect all others.
I'd much rather keep Llorente here despite his enormous salary, seems like a cheaper solution overall, or at least at the moment. 18m surely could have gone towards some other signing. But you can spin it the other way around, Zaza has a resale value since he's young and also his salary is pittance compared to Llorente's. We could gain more in the end. Position of 4th striker in the team might bother Llorente too much. There's that as well.
Vidal? Debatable, transfer fee considering the season he had seems about right, but selling him without getting replacement would always seem like a poor business.
Tevez and Pirlo? These guys can't get you any money, due to age and Tevez's determination to leave, and they can't be replaced adequately unless you're prepared to spend quite a sum and you're willing to put aside some other deals. Especially Tevez, by far our most important player in the last two seasons and finding someone who will bang 20-25 goals per season will always be a challenge.
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Irreplacable memeber of the team. I considered him to be among top 3 players in the world last year, having in mind the season he had. Very few could emulate his level of performances.
You can't miss out to sign one of the most promising LBs in circulation, even at the expense of some other signings. These players are hard to find and I doubt it was either Gotze/Draxler or Alex Sandro.
We signed Rugani in Januray and fee was few mills. Irrelevant for our transfer budget.
Yeah, creative mid was definitely much needed here and he's at fault for not providing the team with one, but it also can't be an excuse for our poor season so far. Most of the teams we have faced have even bigger issues and their squads look shambolic compared to ours.