Looking at Kor’Sarro Khan’s “Master of the Hunt” special rule, it specifies that, as long as he your Warlord, ALL friendly White Scars models that have the Biker unit type have the Scout USR.
This means that White Scar Independent Characters, as long as they are equipped with a Space Marine Bike, have the Scout USR. In turn, this means they they convey Scout to any unit they are joined to in deployment, per the wording of the Scout rule.
One way to capitalize on this ability is as follows:
1 – Take Khan with Moondraaken as your Warlord (either in a CAD or GSF)
2 – Take a White Scar Librarius Conclave made up of (3) Librarians (Stormseers, in White Scar lore), all equipped with SMBs and using the Divination Discipline.
3 – Take an allied Blood Angel Baal Strike Force with (4) full squads of 15 Death Company each, all equipped with Jump Packs and PWs/PFs “to taste.”
Now, attach Khan and each of the three WS Stormseers to a separate Death Company squad. Prior to turn 1, use the Scout move to have all four Death Compay squads get a free 12″ move toward the enemy battle-line. Turn 1, move another 12″ and run a further D6″.
At this point, your horde of 60 superhuman, blood-thirsty (literally), raging, Jump Pack-wearing Death Company maniacs should be on top of pretty much any enemy unit they are targeting, even sneaky Eldar Jetbikes. Turn 2, move another 6″, then charge (with re-rolls for distance from Jump Packs) and rip apart the enemy lines with your 300!!! S5 I5 attacks on the charge (plus all Hammer of Wrath attacks)
To make this combo even more potent, the White Scar Librarians can cast Prescience on their units for Re-rolls to Hit. Khan and the Librarians also add some power weapon attacks into the mix and can, if necessary, break off and charge separate units if the tactical situation calls for tying up as many enemy units as possible.
Overall, this is a very specialized, assault-focused build, but for those looking for a fun, competitive, and unique list built around massed Death Company, I think this battle group could be a decent option.