No, at no point did the Centre try to form a coalition with the KPD, but were turned down. In the Weimar system, it is the Chancellor that is in charge of forming coalitions, so even if the KPD, SPD, and Centre had enough seats to form a majority (which they didn't), they couldn't just form a coalition. This is why Franz Von Papen was appointed by Hindenburg, since he was expected to be able to convince the Centre party and Nazis to form a coalition with the conservatives and monarchists. And why when that failed and there was a failure to form a ruling coalition that Hindenburg appointed Hitler as chancellor to create a Nazi lead coalition.
Who could have seen this coming? Who could have foreseen that all of Web3 was a ponzi scheme that would say anything to get people to pretend hashes on a blockchain is worth 100s of 1000s of dollars. Who? WHO?