Only if you had a Grenade Launcher Falcon. In MP, it was because the pilot's gun was so OP. See, if the pilot has any guns at all, they have the best. If they have none, then the gunners have the best. A quick glance at RL shows this is almost always the case. Even in Halo.
For example: The Hornet gave the pilot weapon control so they had some badass guns. The riders had to use whatever they had, be it Splazer or Magnum. The falcon takes the pilot's weapon control away but gives the gunners access to some badass machine-gun turrets. Therefore, if the gunners have access to vehicular weapons, the pilot probably wont have access to any. Unless it is the same weapon the gunners have access to. (I would have loved for the falcon to let the pilot control a chin-mounted version of the side guns so passengers weren't a necessity.)