This one?
Warwick Builds Sadowsky
With over 80 years of combined experience in traditional instrument craftsmanship, Roger Sadowsky of Sadowsky Guitars and Hans Peter Wilfer, founder of Warwick basses have teamed up to bring a full range of quality instruments and accessories to musicians worldwide under the Sadowsky brand name. With the new partnership, Roger will remain the visionary behind Sadowsky Guitars, with Warwick taking on the task of manufacturing and worldwide distribution. This arrangement allows Roger to remain close to the process while making available several lines of basses, strings and accessories at a wider variety of price points.
Sadowsky bass and guitar workshop making Custom Shop, MasterBuilt, MetroLine and MetroExpress electric basses and guitars for all genres of music
sadowskybass.com
I read that Warwick takes the task of manufacturing and worldwide distribution, but who has the last word about what has to be built is not written in this statement.
For example, I remember that at the beginning of the Warwick "era" Mr. Sadowsky in this thread requested Warwick to don't use anymore the curved Sadowsky logo and white branded Sadowsky pickup logo on MetroLine basses. Do you remember the JJ LTD 2020? I own one.
About the MM bass there is an interview on youtube (check it) where Roger Sadowsky stated that in the past he built several (NYC) custom bass with MM pickups.
About the six strings perhaps Warwick suggested the idea and Roger Sadowsky agreed to go in production because in the past he received several requests for a 6 strings model (after the prototype built in Japan).
Anyway Roger Sadowsky reads this thread and I hope he will say something.