I made this tonight and I must say it was excellent. The chicken was among the most tender and juicy I've ever made. Even my wife thought it was pretty good!

I will definitely make this again!
I apologize for the lack of pictures. We're having some work done around the house and it cramped my cooking style the the extent that I couldn't manage pictures. Suffice it to say my result looked very similar to SFLsmkr1's.
I spatchcocked a whole chicken and marinaded it for about 36 hours. I was able to use a one gallon plastic bag for the chicken and marinade and turned the bag 4-5 times. I used a blender and pulsed the marinade a few times to ensure everything was well-mixed.
I cooked it on my Weber Genesis with no smoke. I wanted to taste the seasoning unaffected by smoke. The flavor is very complex; my wife tasted the cinnamon right away, even though there wasn't much in the marinade.
I held the grill temperature at right around 400 and started with the chicken over indirect heat (between the left and right burners), skin side up. Once the internal temperature hit 140, I turned on the middle burner and turned the chicken over so the skin side was down. I turned up the heat just a bit and crisped up the skin for about 10 minutes. Then I turned it back to skin side up, shut off the center burner and turned the outside burners down to maintain about 400 degrees until the breast was at 160 and the thighs were at 174.
El Pollo Loco started moving into North Texas big time about 3-4 years ago There was great fanfare at the time about the quality of their food. The chicken was good for sure, but the quality and service were really uneven. I suspect the tried to expand too quickly and got over their skis. Many of them have closed up in the last couple years, but a couple still remain nearby. We visit one of them from time to time. The chicken I made with this recipe was much better than what I get at El Pollo Loco.
I grew up near Joliet, Illinois and I remember there being a Shakey's Pizza there as a kid. I remember the pizza was OK, but in Chicagoland there is just way too much good pizza for a chain that makes "OK" pizza to survive long. They've been gone from there for probably 50 years.
Thanks, OP, for the great recipe. I really enjoyed it!