Yes, I leave that last stitch WHEN the next log to be picked up is right round the corner aka a sharp left hand turn. Remember, all bind off rows are RIGHT SIDE facing.
When you bind off for log #7 on the baby size...your next log#8 isn't right around the corner.
I bound off all stitches when I ended log#7.
You could just as easy bind off all stitches for every log that you complete, and pick up fresh stitches for the next log in line.
I leave the tails til ridge 2 is complete...then I tie the two tails together (eg: the tail from the end of log#6 and the tail from the starting of log#7) and weave them in. I do not wait til the entire log cabin is done and then spend an eternity weaving in a million tails!
As for picking up stitches on a 'bind off edge' of the another log...I insert my crochet hook in the front leg. When picking up stitches along a 'side edge of another log', I insert my crochet hook in a bump in the front.
Just experiment with whatever looks best to you. The secret to a neat looking transition (pick up row) is to do the exact same thing for each stitch. Keep it uniform.
My camera battery is dead...so I can't take a photo for you. Maybe later.