I dont think it's the shoe itself he is concerned about. I'm guessing he is thinking along the lines of the post prior to your own, with which I agree.
That's not the way the lacing on these shoes should fit. You need a larger size when it's tight in the vamp area.
And whoever measured you doesn't know what she's doing.
10.5 may be the overall length but I'm sure the arch was larger and the arch is your real size
You're probably an 11.5C
This isn't entirely true. When creating a "wide" version of a shoe, what is really happening is that they are increasing the girth/volume of the shoe. This can be achieved by heightening it or widening it. Very often, to go up one "width" a maker will simply make it higher, not wider. It is definitely worth getting the next width up and seeing how it fits.