After explaining my goof-up I went ahead and ripped all the sections apart and re-cut the black. They are now all ready to be sewn together again. Now to find something to use all those grey triangles. As I notice in my pile of miss-cuts and too many cuts, etc. I have a bunch of triangle neutrals so maybe I'll sew the greys and neutrals together and add them somewhere along the borders. Hate to have anything go to waste here. I fell so stupid that I made the mistake but glad I figured it out before I had gone ahead and sewed all the neutral 2 x 4.5 with the greys too. Think I've got everything correct now.
Thanks for helping me get my spirit back and not turning this mystery into an UFO.