Whether the Caltrain schedule matches the highway 17 bus's schedule is not solely the fault of Caltrain -- it's either a 2 way street, or else they're both neglecting it, unless you have proof otherwise.

You're talking about a bus route with two stops. The only thing it does is travel between Diridon station and downtown Santa Cruz. I'm assigning responsibility for the station's scheduling to the station, which is Caltrain.