Biden Supreme Court Commission Report Highlights

The Biden Supreme Court Commission’s initial draft findings have been released and its initial findings appear to shy away from Court expansion but do contemplate the possibility of panel systems as well as rotating justices in and out from lower federal courts.  While rotating justices in and out from lower federal court sound interesting, I wonder whether the concept will face challenges under Art III, Sec I apply regarding one unitary apex court? See Page 21 of the report. https://tinyurl.com/sbdyk9vf