I think what you saw last night was a fairly typical Cooper 2022 performance, bar the first knock on which I think can be put down to nerves / trying too hard.
He made some good carries, hit hard in defence in a couple of shots but also got found out of position defensively, his stats were as good as your other props, and had he played his 'normal' gametime would have been well over 100m gain, typically at 8/9m per carry.
I'd say biggest thing he needs to shore up with you is his positioning defensively and his attitude / effort to get back to make the tackle, as it seems to be an increasing problem for him in 2022.
That said, I think he's a good addition for you.