His drop on Carney was singly good. Carney didn't like it.

Carney hates been tackled fullstop.

The injury to Achurch has seemingly ground his form to a halt. Hopefully he'll re-group quickly.

(he only got small minutes in his stint)

Yep, I also think he should play out wide in the back row, he's never a prop and he struggles to adjust to the pace of games making him a terrible defender around the ruck.

So what is it that you expect from your Scrum Half? Spend their time tackling? Far too much is being made of one glaring miss. Danny was influential in two tries and made the great kick for Briscoe's try. His attacking kicks in general play are good and his direction of the attacking and defensive formation occupy a good deal of his time and free up Kevin for a more defensive tackling role when Rob is at Hooker.
I thought Danny had a good game all round. We drew against a very good Cas team performance and, woops, went top.