Ujfalusi was free. IDK, if Barca wer signing CBs for fun, but they got Pique and Caceres. Real got Garay. Not saying we would have definitely gotten them, but they were on the market. Kompany went Newcastle, Corluka went Tottenham, Chelsea seemed to be willing to loan Ivanovic. Even Matteo friggin Ferrari would have been a better option than the two we got. He was free and went Genoa.
Gilardino actually looked good against our defence. He made Mellberg look a fool with that goal and he won more than 755 of the air balls against Legro.
so lets review theses players one by one as far is i know them:
it seemed that we was in the race for Ujfalusi, but he decided against us ... i don't know if it is because he wanted a new challenge or he thought he would be only a backup when chiellini and andrade were fit ... i just guess they offered him a better wage packet with the opportunity to play more often.
Pique is so far unproven, that can't be the signing you wanted as top centre-back, can it ? (he only got 12 appearances)
I don't know much about Garay, but we can surely say that Real Madrid have enough money, that they don't even have to care if Juve is interessted or not. They simply can outbit us with wages and transfer fee, so no chance here.
Loaning Ivanovic from Chelsea without the right to buy would not be a clever move ... we pay to develop a player for them, so he does his mistakes with us and then returns ? no smart move, that is the reason why milan didn't do this as well.
I always thought Corluka was a right back, but if you want to consider him i guess it's like the same with the other money grabbers ... i see the trend that people from poor countries are more like gold diggers that just look at how they can grab as much money as possible, because they know the poverty in their homecountry (popular cases like ivanovic, robinho & co show this).
Kompany was only sold by HSV because he was injured very often and also had disciplinary issues with the club ... you would have bashed the board for buying andrades your brother...
don't know bout ferrari ... he had a couple of decent games with roma, but i guess no one would consider him as top cb.
so from the ones you listed i don't see anyone that would be considered as top signing that had a realistic chance of coming to us.
sadly, knowadays we can't compete with the english clubs money, but i think it shows enough about the character of the people that go to a crap club just to get a few bucks more ... i hope they rot in the rain of london
feel free to share your opinion about who you think would have been possible to move to us.
from the above list i think ujfalsi was the one that was most realistic