Tough choices. The positive here is that you're afforded the luxury of having several good options. Hard to predict how things are going to pan out. Sunday's fantasy outcomes don't always follow Saturday's logic.
That being said, I think that you keep Robinson as your number 2 ... which is a close call with Jackson. VY will likely try to force the ball to him .. which can either lead to a circus play for ridiculous fantasy booty or a pick six for the defense. Robinson is a safer play. The downside with him lies with the distinct possibility that Dallas goes up by a few scores and then runs the ball for the entire second half. That scenario does not bode well for a receiver who has THREE targets last week - granted, two of them were in the back of the endzone. He has obvious chemistry with Romo. It'll be interesting to see what happens when Miles Austin is at full speed.
If Gore plays, slide him into your flex. If he looks shaky in pregame warmups, substitute DJax into your line up. It's reasonable to be speculative regarding Gore's contribution (if they take control early) since they have only a short break before they face a tough defense in Baltimore on Thursday. The 9ers want to keep their star back fresh. They know they're playoff bound and Kendall Hunter has been a worthy complement to spell their injury prone workhorse.
Take a look at my lineup quandaries of the week?viewtopic.php?f=19&t=508924