I for one am glad for that. My go to rounds for a long time. When they stopped making the MM strings I was fearful they'd be gone for good. Was psyched to see them back for a lower price.
IIRC there was no gap with the name change. In fact I saw some dealers discount the MM sets when the non-signature Fat Beams arrived.
I've been using Fat Beams for a long time. I didn't buy them because of Marcus. I bought them because I played them on another bass. I keep buying them because they work very well for almost all of my basses.