^I feel like every time a flop artist is dropped it's all 'we've decided to part ways' PR fluff, when really everyone knows like your last three albums bombed and you're about as relevant as a popsicle in Antarctica, so.
I believe its true in both these cases.
Leona gave a very detailed account why she wanted out. They just had lame ideas and were forcing her down endless covers projects and second or third hand ideas no other artists wanted in the label. She had a career vision and songs she wanted to make and had them pretty much already done for her Universal deal. Will Young was the same - he'd had actually a lot of success at Sony (his last Sony album was a critical and commercial hit) but felt they were running out of ideas for him and driving him towards safe, housewives music.
Both went to Universal and came out with bad albums that sold poorly or flopped.
Unlike Sony, they had nothing behind them to cash in off as utterly new artists to the label, so their failures were a lot more isolated and exposed.
Its not always a disaster. Robbie Williams made a pretty successful move from EMI to Universal for example. But I think going to a new label after so many years in another is massively high pressure when you're an artist on the outs and your glory days are all anyone cares for. You're bringing nothing with you so the new project has to be a success. Christina is practically a legacy artist already because she's made so many bad music decisions. The odds of her delivering anything impressive for Universal are remote imo.