AMES, Iowa (AP) - Iowa State has offered an assistant coaching position to the Cyclones' undefeated, four-time NCAA wrestling champion.     Cael Sanderson met with ISU wrestling coach Bobby Douglas and athletic director Bruce Van De Velde, who formally offered Sanderson the job.     Iowa State doesn't want to let Sanderson get away from the program like Dan Gable did when he left Iowa State in 1970, eventually taking the head coaching position at rival Iowa.     Sanderson has yet to decide whether to accept the offer. Douglas said ISU has been contacted by other schools regarding Sanderson's availability.     ``We haven't gotten an answer back from him,'' Van De Velde said Wednesday. ``There's no rush though. Wrestling season just ended.''