IB versus CTA

As you all probably know, it is becoming more difficult for a person or company to become an Introducing Broker in the Forex world. I have a question - is an IB the only sort of entity that can act as an “introducer” for receiving trade rebates? Or, if a firm registers with the NFA as a CTA instead, can a CTA receive trade rebates from the FCM just like an IB?

I know that right now this question is moot in Forex, but when the rules change it will be much less onerous and much less costly to register as a CTA versus an IB.