The x-1 can't control the non ttl / old versions of the 360 or the v850 or the v860 or the 600. The trigger works great with the ttl 360 Version only and the new v800 series.
There is a reliable source that says a receiver will soon be available to allow the new Godox 2.4G Wireless radio system transmitters to control the older Godox Manual only flashes that have the wireless control ports for the 433MHz FT-16 and FT-16s receivers ( https://photography-on-the.net …showthread.php?p=17790510 ). The new TTL AD360IIc and TTL TT685C, which have the new 2.4G Wireless Radio transceivers built in, also have the wireless control ports to allow them to be used with the 433MHz FT-16(s) receivers.
The older v860c is a Canon compatible TTL flash so it can be controlled with the new 2.4G Wireless system when attached to an X1-c receiver.
It is easy, even without a special receiver, to incorporate the older Godox Manual only flashes into the new 2.4G Wireless system in one of several ways. As you pointed out above, you can stack an FT-16 transmitter in the hot shoe of an X1-c transmitter. You can also place an FT-16 in the hot shoe of an X1-c receiver or you could just use an X1-c receiver for each of the older flashes. If you use a TT685c or AD360IIc as Master flashes then you will need to use one of the methods with the X1-c receiver.
I have been personally testing the new Godox 2.4G TTL Wireless Radio system, which includes the X1-c, AD360IIc and TT685c, to see how well these new Godox components will incorporate into both the Canon Wireless RT system as well as the Manual only Godox/Cheetah system. Rather than take up space here I will be posting all my experience's in the following thread: https://photography-on-the.net …read.php?t=1444958&page=1