Totally agree with TopGunn. I'm not only looking at the player's value now but also his potential upside value. There I've listed Arraez at the top, he's not needed at any position and we can still trade him on the Tony Gwinn hype. He's only a one tool guy and we need to trade him before he bottoms out, the rest I see more upside.
#2 I'd list the DH group, the ones that have a good bat and weak glove. Although these don't have much value there will be an opportunity when the DH is adapted. FO needs to work their butts off trying to sprinkle them through out trades to alleviate this horded commodity, to help free up and balance out our roster.
To me Kepler is a golden glover at RF. If Kepler finally adjusts to the non-lively ball he could easily double his value but although we need highly defensive depth at CF and SS, RF isn't an issue. Because of our need for high end pitching and his trouble to adjust, I'd place Kepler #3 and use him injunction w/ others to obtain the pitching we need.
At catching we have depth with Garver, Jeffers, Rodvedt and others in the minors that are overlooked. Having 2 RH hitting catchers is counter productive, Jeffers because of his potential is baked into his value and of his arm, I'd place him #4. Here I wouldn't trade him unless we had a great deal that's important to the success of the club. If we do trade him, we need a Castro type to fill in because most of our depth isn't ready.
#5 are our pitching prospects. Here I'd hate to trade any of them because you can't have enough pitching. But I can't help but to do this because most important deals would require this.
#6 At the deadline, I'd take a long look at Donaldson and Sano. If Miranda is ready, I'd trade Donaldson. Sano is a difficult to figure out.
Here is where I'd like the FO focus on not overpaying low ceiling dumpster divenees.