SANTA CLARA — The 49ers aren’t into spoon-feeding their rookies a little at a time.

Rather, defensive coordinator Robert Saleh believes in system overload. Just learned a new assignment? Better be ready to junk it and move on to something even more challenging.

It’s been that way so far for Marques Sigle, a fifth-round draft pick out of Kansas State who appears to have an inside track to be a starting safety Week 1 on the road against the Seattle Seahawks.

It will either be Sigle and Jason Pinnock, Sigle and Ji’Ayir Brown, or Pinnock and Brown. The 49ers are in the extremely early stages of game-planning for Seattle on Sept. 7, so Sigle’s probably got a good idea already whether he’s starting or not.

But it’s not his story to tell yet, so Sigle offered up no hints Thursday following a

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