I don't own any of those cameras but I did use my DSLR with Ekos before. So somethings you might want to check on each of the camera that aren't working.
* Are you in BULB mode on the camera?
* Do you have Mirror Lock on or off?
These values need to match with what you have in Ekos, otherwise its just going to be a nightmare. Ekos and Gphoto can't control these, so you need to make sure the values match manually.

I can't remember what happens if the camera isn't in BULB mode but Ekos is, but I do know what happens if you have a mismatch in mirror lock up as the camera will thinks it should put the mirror up waiting for another command but it doesn't receive it, then the camera's mirror lock up will time out.

Basically if you can get gphoto2 to work, you should be able to get Ekos to use the indi_gphoto driver to work, there are aliases for this different type of cameras and since you're getting camera details while it connects that says the driver is working.

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