Turns out my second vid in this thread is Lemon, Zest's twin brother. (It's been too long and won't let me edit the post now.) It was hard to tell them apart unless side by side. I eventually banded their ankles different colours.
Lemon & Zest both got sick recently. Zest rallied but Lemon passed away gently and quietly in his sleep last night. I'm not too upset about it. I have too many roosters and would've had to cull some eventually anyway, so I didn't let myself get too attached. Also, he was sickly, right from the beginning, and I didn't think he'd even make it this long. He was named Lemon for a reason.
I sent a stool sample into the lab last Thurs and am awaiting results. Long story, but I suspect mycotoxicosis (moldy food). I've since dealt with the suspect food. Chalk it up to my learning curve.
sigh
Poor little guy.
In memory of Lemon, here's a vid of the twin brothers dueting.