Background & appearance for new Blood Angels army

I have decided to create a new 'successor' chapter. My previous successor chapter was called the Red Skulls & was loosely based upon the Flesh Tearers. I have decided to go in a different direction this time & I love stories about time travel & parallel universes. My chapter comes from a very dark parallel universe wherein the great & tragic civil war occurred in the reverse order... That is, the loyal Legions went to Chaos led by Sanguinius, the heretical chapters remained loyal fighting on the side of their Emperor. Their heresy was more of a stalemate and over the course of 20,000 years the Empire was brought down. All of the loyal legions were eventually purged. My Blood Angels army will represent one full company of Marines that crossed over to our universe during a warp jump in their battlebarge. They came from the distant future when little was left of their own universe. They overrun a backwater planet close to the Eye of Terror killing all the civilians after learning about the history of mankind. Their leader, the last Sanguinary High Priest, decides for their battle company to take in the pretense of a Blood Angels successor chapter and rename themselves as the Blood Saints. They wear pristine white power armor with a bright red jeweled blood drop emblazoned upon their shoulderpad. Assault Marines wear red helmets as well. The Blood Saints have mastered both the Black Rage & Red Thirst but still drink the blood of their slain enemies to absorb their power. They still tend a large Death Company that wears the traditional black power armor. It is the highest honor for any Blood Saint to join the Death Company. Their leader, the Sanguinary High Priest wears a suit of blood red highly artificed black power armor to denote his rank. The Blood Saints use their facade as a means to infiltrate Imperial locations and raid them for supplies. No prisoners are taken. The Blood Saints prefer to all fight with jump packs & enter the field of battle in their highly prized Stormravens. They also make use of as many dreadnaughts as possible.