It would appear there are two speakers present in Revelation 10 and 11 (“another mighty angel” 10:1 and “a voice from heaven” 10:4). Whomever is speaking, we read the ability to prophesy with power given unto “my two witnesses” in 11:3 and the additional powers given of fire to “devoureth their enemies” 11:5, “shut heaven, that it rain not in the days of their prophecy” and “waters to turn them to blood” and “smite the earth with all plagues” 11:6. Also, these powers were given for a well-defined mission.
None of the above were original spiritual gifts given by Christ to the Apostles or other disciples… Mark 3 and 6, Luke 9, and Matthew 18:18 …these are not mentioned here. So, I believe these gifts mentioned in the gospels were not required to fulfill this mission of God’s purpose. Also, as an aside, closely examine Revelation 10:3 where John is told, "Thou must prophesy again before many peoples, and nations, and tongues, and kings", so I'm not so sure they are O.T. saints.
1Timothy115's post in Bringing back the real meaning of the rainbow was marked as the answer