It's really obvious what happened with the benefit of hindsight. They wanted Silva, couldn't get him and Allardyce had us by the balls as things deteriorated in the meantime. There was no point in looking for another long term manager at this stage because they were clearly going to get Silva in the summer otherwise, his sacking was irrelevant. Allardyce and his bloated contract was a necessary evil in the circumstances.
It wasn't pretty, and it certainly wasn't cheap. But in the circumstances you can see how it ended up that way and you're missing the point somewhat if you're questioning why we didn't go for someone else instead of Allardyce once we couldn't get Silva.