If Cersei wipes out Olenna he's probably getting Highgarden, isn't he? That'd a big upgrade.

The weapon seems pretty dumb, and it's actually pretty shitty for something they have spent "months" trying to create.

To be honest I don't think they have much use for the character anymore (he didn't show up until episode 6 last year either). He was far more interesting with Tyrion, and after he left King's Landing they don't seem to have much for Bronn to do.

No. Nymeria is named after a Dornish-warrior queen that unified Dorne.

As soon as Olenna said her little speech to Dany I knew that plan was going nowhere.

I think those were the two Sand Snakes that were killed on-screen.