Let's revisit FAQ vs Errata again...
An FAQ is a clarification of the rules as written that can be extrapolated to similar situations as applicable.
An Errata is a change to a written rule--whether in the RRG or on some game component--that cannot be extrapolated to other situations based on the original wording because the original RAW is not applicable.
The Instigator ruling was an FAQ.
Not an errata.
Meaning that, for any other identical situation, the ruling can be extrapolated to apply because it is consistent with the way the designer interprets the RAW.
Following this logic, Entrapment Formation can boost an ET to speed 2.
So do we consider each FAQ case be case with no intent or application to other interactions? Or do we use them to interpret how they should influence other interactions?