I'm pretty skeptical that Oakland will move him, but a strong argument for Rooker is a kind of obvious one: hitting HRs is huge for winning. We have seen this team be able to claw guys onto the basepaths, but then it's that second or third hit of the inning that we are missing. The HR threat on this team is Cruz, and Reynolds is a solid HR guy.
If you can convert some of those opportunities into 2 and 3-run HRs with Rooker, that's pretty significant.
I like Yandy Diaz a lot, and it seems like a foregone conclusion he's being traded at this point, but it's also hard to deny that trading with the Rays is not a fun proposition.