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Brindle is stripes. Multiple things can cause brindle including gray skewing, roan skewing, chimerism etc. Some people who don't understand why we call colors certain things and are just parroting get obsessed with if something is skewing OR brindle because they don't really understand what these words mean.

A common cause of brindle on grays is skewing.

No.

Brindle just means stripes. Lots of things cause stripes. Some genetic, some embryonic. Only rarely does a mutation cause brindle but it is one of the multiple ways it can happen.

Gray skewing is when a normal gray gene gets messed up in embryonic development and does not turn on in all the cells. Skewing is never inheritable.

If the cause of a brindle gray is a mutation the mutation might be inheritable but the stripes would not be.
Real-world example the stallion Catch a Bird was brindle because of a mutation, his mutation was a new form of roan. That was inheritable, his stripes were not.

Brindle is a big old umbrella that lots of different things fall into.

Think of Brindle as an umbrella term instead of an actual gene. It's just a term used to describe something we see, without knowing the actual cause.

@Brandybrookes I seen that horse as well and wondered if someone would ask about him. Thank you for posting.

I saw a post somewhere that was about this mare and it said the cause of her 'brindling' was Lines Of Blaschko (https://www.iflscience.com/you-have-invisible-zebra-stripes-and-theyre-called-lines-of-blaschko-68354)

Thank you for sharing. She's beautiful.