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FBinNY: Yes. That is my point, exactly.
If you re-read the OP, there is some considerable inaccuracy in the reported measurements
Originally Posted by himespau
[...] maybe a 1/4 to 1/2 inch apart. [...]
(i.e. 1/4"~1/2")
and some doubt cast as to the origin of the grooves:
Originally Posted by himespau
[...] unless he/she tried braking with no pads in the holders or something - but that didn't seem to be the vibe I got [...]
Insofar as they are identical, they can be assumed to be there by design, and thus wear indicators. Or at least, functionally equivalent to indicators, as you pointed out in your previous post. I was pointing out a reasonable way the OP could determine a likely answer to their question.