He's done. A year out of the game being in retirement without training like you normally would for a return to the game would most likely turn into a huge drop off in production. But this is Marshawn Lynch. He defies the odds.
This would be a public relations move on the Raiders part.( especially that they could be moving to Vegas).
Marshawn Lynch has always wanted to play for his home town team the Raiders, and there isn't any doubt he would be in peak shape .( can't embarrass your self in front of home town fans).
The Raiders don't need M Lynch to be their bell cow Rb, as they have their two Rbs they are high on Jalen Richard and Deandre Washington . ( c Patterson might get a couple touches) m Lynch would be a nice complement to those two Rb's.
Also it's why A Peterson wanted to play for the Raiders. Who wouldn't want to run behind that Raiders offense line. Big diffrence Running behind the Raiders offense line versus Seattle's.