Brilliant Strategist does not grant a free CP. That's an Azrael-specific thing. The trait lets you gain a CP on a 5+, and it gives you a free reroll of a hit, wound, or save roll. Still the best trait in the book hands down.
And in the Stratagems, you can't forget one of the most useful ones Dark Angels have access to: Intractable. If you have a powerful unit like Hellblasters or a Land Raider that got locked in combat and had to fall back, being able to spend 2 CP to let them still shoot is cash money.
Now, as for LVO results:
Aaron Wisch had the highest finish of all the DA primary lists, coming in 68th. He faced a variety of opponents, including Drukhari, Marines, Tau, and Imperial Knights, and his only loss was to an Eldar Soup list with 3 Alaitoc flyers in it. He had one draw against Knights with Custodes Jetbike Captains and the Loyal 32 for a final record of 4-1-1. Not too shabby for a mid-tier army!
Shaun Sharp's DA Dreads with Guard Support was the next best DA list, with a 4-2 record. He finished 136th. His losses were to Eldar Soup and a weird Space Wolves list with a Falchion in it. Still a pretty strong showing to go 4-2 in the most competitive environment imaginable.
None of the other DA lists did better than 3-3, and most went 2-4. Alaitoc Flyers seemed to be the bane of most of the lists, as from what I could tell only one of the DA players who faced them won their game. This makes sense really, as our best damage dealers are plasma weapons and they don't like all the negative hit modifiers at all. I went through and took notes on what armies each DA player faced and which they won against to try to figure out what we consistently struggle against, but really the data was inconclusive other than the Alaitoc flyer thing (but let's be honest they give a lot of armies fits). I might also say we tend to do well against other Marines (loyalist and Chaos), but then Marines in general aren't the pinnacle of the game currently.