Scarab's impact on Diplomacy
So one of the things that I have thought about regarding Blue Beetle and the Reach was why exactly they needed an infiltrator unit in the first place. Their comic plan would have worked without Beetle fighting for them, and besides if they needed fighters, Tovar or the Reach probes or off world Scarabs could have also done the job. So why take the security risk of having a scarab?
The short answer, Diplomacy.