If 1580 flips to "True Oldies" then what will feed 92.9 in Columbus?? The translator at 92.9 should be repeating whatever is on 1580 WXGT.
Neither of the 92.9 translators are permanently married to their AMs. All they have to do is file a primary station change with the FCC to be legal. And 1550 can legally be the parent for both W225CS Columbus and W225CM Delaware.
What I find unfortunate is that, even as often as the subject comes up, a lot of the participants here operate on the erroneous presumption that every translator rebroadcasting an AM has to do so in perpetuity.
Perhaps I can offer some clarification:
Under former FCC Chair Ajit Pai's "AM Revitalization Act" there were two filing windows opened that allowed the move of an existing translator up to 250 miles in order to retransmit an AM station, but those licenses only mandated a four-year period of being attached to the originating station, and that period ended over four years ago.
Here is a more detailed explanation from
@Michi's website:
home.recnet.com
Subsequent filing windows were opened for new translators for AM stations. The authorizations for stations constructed as a result of those windows
are permanently tied to the AM station; they cannot change originating stations or be sold independently of the parent AM.
Again, Michi gives a more detailed explanation:
home.recnet.com
So: How do you know if a translator was "moved" in those first two windows? Here's an example, again using Michi's wonderfully extensive resources. From FCCdata.org, here is the page for W288DK, which had been retransmitting WWHK in Myrtle Beach SC but is presently off with a Silent STA:
Scroll down to the bottom of the left column and you can see that, prior to January 23, 2017 that translator was in Port Wentworth GA and retransmitting FM station WLFS. It was moved and became a translator for AM. But since it's now nine years since that move and it was moved rather than newly constructed, it can, as Lance said, legally retransmit any station whose primary service contour encompasses that of the translator. And that means that when they turn that translator back on, it may not necessarily be using WWHK as its originating station.
Now let's look at WXGT's translator, W225CS:
Oh, look! Another 2017 translator move-in. Has it been four years? Yes, it certainly has. So they are no longer required to have it retransmit WXGT. Which, finally, answers the OP's misconception.
. "We're not what you think we are." 
