So you know how all these Shin clones are there and also the hooded guy is Shin I think they are all white Zetsus but an upgraded version of them, like ability wise. Like a White Zetsu V2 version, so the next evolution of Zetsus aka Shin.
Look at Shin as a rural terrorist that had access to tools in order to build an arsenal. He is not sophisticated, he doesn't have fancy powers, he is a resourceful villain with his own agenda that somehow as able to clone himself.
You remember when Madara said to Obito that all who shared his ideals were Madara ? In my opinion that is Shin and the young ones, they all share the same ideals, therefore they are all Shin and clones.
Can be possible.If white zetsu are cultivated using uchiha cells same as kabuto used hashirama cells.As every shin is going to have same ability & same MS