We worked in the indoor with Archie and Megan for a while at walk and trot. Then we went for a walk hack down to the end of the gravel road. Then we had some walk, trot and canter work in the prairie. I see what you are talking about with the right lead. He would rather take the left, so even if your timing is right, he waits a beat and takes the left. I carried a stick (ok, a boxelder branch that I snagged) and used it once lightly behind my right leg on canter depart for right lead and then he was spot on.
I worked with Leo on the flat with Kelly on Elsa and Megan on Archie. We worked in all gaits and Leo did well, though he mentioned that the load of hay that was standing in the middle of the arena looked delicious! Then we went on a hack around the meadow, using all gaits and he was great. On the way home we all stopped and let them graze. I took off his bridle and let him eat a bunch and also hand-picked him some for enjoying back in the stall. Nice day for all!