Why did so many people believe Henry VIII would remarry Anne of Cleves after Catherine Howard's fall?

While researching my forthcoming event, The Rise and Fall of Catherine Howard, I noticed something fascinating. Anne of Cleves kept appearing in the primary sources surrounding Catherine Howard's downfall.

By the end of 1541, Catherine Howard's marriage to Henry VIII was collapsing, and rumours spread rapidly across England and Europe that Henry would take Anne of Cleves back as his wife.Anne's own brother instructed his ambassador to seek a reconciliation. The King's Council investigated extraordinary rumours that Anne had secretly given birth to Henry VIII's son. Foreign ambassadors report ...