It's a fine comparison. Moon said he wasn't worth $2M. He was clearly worth well more than that at one point. If he's gotten past his vertigo/concussion issues, he could be a solid get.
I'm not saying you'd get anything substantial for either of them, but you could help fill out your AA roster. Crappy players get traded all the time. I think Marrero would be very useful to an NL team that needs a backup IF with a good glove. Holt was a 2 win player in 14 and 15. He's a good buy low candidate for a team that has room for him.
If they turned it around and became a 95 win team without getting JDM, it wouldn't be too surprising. Maybe 2017 was just a down year? I'm not counting on it, but optimism this time of the year isn't a bad thing.