ARi trade is ok, but the other trades have problems.

That Dallas trade - I get your logic, reuniting Patches and Radulov. Problem is that they'll play different lines. Radu will be in the first line, while Pacioretty is just going to take Janmark's place at the 2nd line winger. And that pretty much soils the deal. Janmark is upgrading young forward who had a decent season, whilst Patches had a bad season and his ending contract brings a certain risk... Adding a first rounder from Dallas in that trade is just bad idea. I think Dallas would be better off without making that trade.

And Kings have no need for Petry. They already have a surplus of big money d-men (Doughty, Muzzin, Martinez, Phaneuf). Adding Petry is pointless - no team would want to have over $3M third pair d-man.

Your wrong on Petry. He played top pairing minutes with Weber out and was solid getting a career year of 12g 30a for 42 pts. He is a perfect top-4 right handed d-man...which is something you didn't mention. Matinez, Muzzin, Phaneuf, Forbort are all left-handed.
3m for Petry for the next 3 years is a deal for the Kings

In a sense, yes. But to make that work, I think one of those three should be traded. Like said, they really cannot afford to have 5 over $3M d-men in the team. It's inconceivable.