Think your underselling his cost. For one thing the years of control mean they don't have to deal him. His 2.5 fWAR is the 16th best pitcher in the majors. And on top of matters, look at the contending teams. The o's are in first place and have the 3rd worst ERA in baseball among starters. Red Sox are the 12th worst. Miami is looking for starters. Texas is looking for starters. Mets probably are but not at that price. There's probably more but those are the bigger names.
I don't think Pomeranz get quite Shark level prices namely because Hammel probably doesn't get enough credit as part of that package or for that matter even Miller level prices but i don't think that's far off. If you're San Diego there's no real push to trade him other than being shit but capitalizing on your current pieces who are worth something is one of the keys to a quick turn around. That's why the cubs currently have Hendricks, Edwards and Grimm and Russell on their active roster not to mention Strop and Arrieta though in Arrieta's case that's not the norm.
I doubt Candelario or McKinney even gets the conversation started for him. If we assume none of the MLB pieces(ie Baez/Soler/Almora/Contreras) are being considered then in my eyes you'd have to starter with at least Torres, Happ or Jiminez in any conversation for him and possibly multiple of them. It's why I prefer the idea of going after someone who's got a crap ERA right now but looks like they can be fixed. I really like the idea of Kevin Gausman but I still haven't quite figured out a way to make it work other than a three team deal with Oakland and admittedly that idea is a bit flimsy with no real inside rumors there yet though it could work in theory.
SD is seeing themselves in a winning window after the control is over. They are looking at future control after some of the contract commitments go away. Candy fits their profile. They are building around Meyers at 1B now.
Matt Kemp rf 16-19:$21.5M/year
Melvin Upton Jr. cf 16:$15.45M, 17:$16.45M
Those 2 you are stuck with. CF is opening up. Manny Margot should be ready soon. Yangervis Solarte can be moved to 2B if they gained Candi. Upton's control ends after next year and McKeeney would be in AAA next year anyways. That park prefers LH gap hitting so he might excel in that park.
Now McKenny is a top 100 player and Candi is ranked #7 3B prospect in baseball. It is not like these guys are mid tier talent. They are closer to the north side. If the Pads started talking about a SS to replace Alexi...and they really don't have any close anyways. but they have Javier Guerra at A adv and is the #50 prospect in BB. Add to it he is known for his D first. I don't see them blocking him at all.
The crap ERA is fine with a low cost input but they still have to address this year vs next year.
Hunter Renfroe is on the temp inactive list but profiles as a RF with his plus arm and power bat.
You could be looking at Kemp, Margot, Renfroe next year out there. Upton may become quality trade bait this year in view of this. Both guys are at AAA on the temp inactive list.