rusty crayfish in the creek nearby is not totally unexpected
Having a rusty crayfish source to put in your pond, a bad thing?
I've never heard that they taste bad to the LMB or SMB and where rusty crayfish are present the bass population doesn't mind at all from what I've been reading about in MI

The downside would be if you had your heart set on having a very specific type of crayfish in your pond and found out that the rusty variety is outcompeting the one you had your heart set on?

I'm not a rusty crayfish ID whiz, the rusty variety in MI are easiest to identify based on the rust colored round circle on the thorax and I didn't see that clearly in these pictures

crayfish of any type fill the bill fine for a forage source for larger fish. That was the goal, yes?