I am not disagreeing with you light working on stand I am a firm believers in what ever works for you is the way to go.
But I could never work 2 light simultaneity on a setup.
First, I call with my light off so I wouldn't wont another light to come on when I am working the call.
If both the caller and the shooter are working lights . I don't feel there is a lot time to be putting lights down to shoulder you gun when the target makes a show. I think that just the movement of 2 beams of light working and bouncing shadows would be more then coyotes and a cat's would like.
I call from the ground and from my high rack and in each case I like the trigger guy to be following my light with his eyes and his gun at the ready he don't need to have his gun at his shoulder but real close. this like i said from my rack or the ground.
As for the guy with the light seeing things that the shooter can't see ,
I will never set up and work the light if the trigger guy cant see every thing i see .
I stand or sit just over his shoulder , truck or ground. the purpose of the light is to hide caller and shooter from the target by us being lost in the beam. As they look at the sound of you call they are looking in to the light and any movement will be hidden by the light.
That is what i don't like about working 2 light if your hunting near each other i would think that 2 lights would light each other up.
The way i like to work a set up from high rack or ground with the shooter being a gun hunter is to be just over the shooters shoulder i will call for a length of time with my light off, then in my brakes from calling i will turn my light on and work it 360 degrees , The hole time the shooter is following me with his eye's and shoulders.
if i pick up eyes i will shut the light off and lip squeak to give my shooter time to get ready and direct him on target in case he mist the eyes. now that i see he is ready i will turn on my light and start to call with the light on to get it as close in as i can for a good shot .
Coyotes are shot at when the shooter has a good shot to take ( when he is comfortable he shoots) but cat we will get really close before the shot under 40 yards or closer (depending on the shooter comfort zone again.) i think cats are taken away in a dream land by the light sometimes and will get right in your lap if you let them.
but like i said what works for you is your best bet.
George