So, you're confused about Redict using the LGPL. I thought you weren't allowed to change the license of a FOSS project like that?
Well, you're right to raise an eyebrow at that, but note that this only applies to copyleft projects. Permissive licenses are characterized by, perhaps even defined by the fact that you can sublicense them.
To relicense a copyleft project you would need all of the copyright holders to agree. A CLA is designed to grant a single entity[...]