I would leave them in for now. If you unpick them, you'd have to use fray check or something else to stabilize them so the rest of the thread doesn't come loose.
For next time:
When sewing that piece in the block, I would have gone ALL the way off the edge so it wouldn't be a problem and I wouldn't have to worry about where to stop.
If you were consistent, those lines would have met up (or close enough) on the back. And if they were a bit off, it wouldn't look any worse than the little knot hills from stopping and starting in the middle of the block (unless you were going to bury all your threads).
Or I would have used a thread color to match the back so it wouldn't be so noticeable.
For the record, it's only really noticeable to YOU. I'm only seeing it because you've got a close-up.
This fails the "Can I see if from a galloping horse?" category. :mrgreen:
It's not a big deal. But you can keep the other options in mind for the next quilt.
Isn't it a great method! I LOVE QAYG.