DiDi (NYSE: DIDI ) stock rallied 10% last week, so it’s time to revisit its bullish thesis. But, before we move forward, you shouldn’t let that weekly stat fool you, it has been painful owning DIDI stock. There isn’t one reason for what ails it. But the bulk of the blame probably lies in the overall problem in Chinese stocks. This debacle is long in the tooth. With a bit of luck, it’s coming to an end. That’s especially possible since investors are eager to be bullish again — last week may have been the start of the recovery. Another…