Since Letti joined the White Bridge pack in Orteaux, her mind-linking with the Sabertooth pack was cut off, and she joined those in the White Bridge pack. She had not known for long what activities or plans were circulating in her father's pack.
But she knew her father had sold his soul to the devil to obtain magic power. Plus, there were suspicions that Alpha Harland had an inexplicable partnership with the rogues.
That explained how the rogues suddenly got their fortunes, and their numbers grew.
Even though Khan possessed magic and was skilled at it, he wouldn't be able to fight a group of werewolf rogues with Alpha Harland using black magic.
It would be a different story if the Sovereign token were in Orteaux, protected and fortified the territory of the White Bridge pack.
If Aria had just left this token, the no-face squad members would not appear because the only person who could control this token was the owner.