If you believe projection systems like ZIPS, Steamer, PECOTA even Marcel, you could start there. A couple of those are on Candelario's FanGraphs page. I thought those were really conservative and that he could potentially bounce back to at least the 2-win level (where he is at right now, not even halfway into the season!), mainly because they take recent performance into account and I'm not sure where age fits into them, but again, he's only 29, not 34, so I just couldn't imagine that he was at the end of his career.
I also spent the entire winter in the offseason thread talking about how I thought we should (have) re-sign(ed) Candelario, and irritating a few of the cool kids with my persistence along the way.
All this said, two things:
I get why we didn't re-sign him, although I didn't agree with that then and I definitely do not now.
As right as I was about Candelario, I was wrong about an offensive rebounding for Schoop. Even though his defense is still aces, his bat can't support it, so even at 31, he might truly be done done.