The early US contracts were done on the basis of individual releases, and obligations related to those releases. Capitol, being owned by EMI, always had the rights to release The Beatles. However, if Capitol passed on releasing something, which they did up until the I Want to Hold Your Hand single, they were free to shop around for release. Hence, the rights to early releases going to Vee Jay, Swan and Tollie. They gained limited, and conditional, rights to release material that Capitol had passed on.
Swan only had the rights to the She Loves You single, Tollie - I think ...