Gulf Air does not seem to have any formal position on a FAA Certificate (they don't issue "licenses") but that is just nomenclature.
In the past and present though, both DGCAM and BCAA have had issues with FAA Certificates. These issues disappeared though when the candidate had a type rating and time on a comparable sized aircraft-- if a guy came to Gulf Air with a rating and/or time on a 737 or a 727, it would not be a problem. Honestly, I don't understand the logic on this licencing issue but then again, many countries' licencing schemes suffer logical disconnects from time to time.