I actually like to see variations in the color of the shell. And it is very difficult to avoid. They have to use two different pieces of shell to make the shoes so the hardest part is matching the shell pieces in terms of color. I believe it is @mdubs
who has a pair of alden lhs loafers in ravello where the strap is a slightly different color than the rest of the shoes. Looks absolutely fantastic to me. Other than display models affected by sunlight etc., I don't think certain variations should automatically disqualify the shoes as seconds.
I agree, Buz has posted a pic of his Whiskeys with a darker strap. On my Ravellos, the strap looks the same depending upon the angle. From some angles it has a nice flair to it. Same thing with my Walnut Shell Strands.