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 f

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