I don't think we've not learned our lesson. We wanted Koulibaly, he was our main target. We were obviously led to believe there was a chance we could sign him, so why would we have just gone onto B or C target when our number 1 target could be obtainable. It's a bit naive to believe the board were only focusing soley on Koulibaly and didn't have back up options, but they wouldn't have known it would be so hard to negotiate with Napoli, or that they would have been wanting so much money for him. He is a risk for us after one good season at Napoli so we are within our rights to be cautious about overspending for him.
The board have obviously tried hard to get him, but it's just proving very difficult. At the end of the day no concrete news (apart from poor sources) has come out on whether there has been a contract put forward or whether Koulibaly will even accept. I think we should just wait before people start slating the board once again (and without good reason) and accusing them of poor business. So far we have done very good business, but it's simply not as easy to get every single target the club wants without resistance.