mark 14:61“Are you the Messiah, the Son of the Blessed One?”
62 “I am,” said Jesus. “And you will see the Son of Man sitting at the right hand of the Mighty One and coming on the clouds of heaven.”
luke 22:67 “If you are the Messiah,” they said, “tell us.” Jesus answered, “If I tell you, you will not believe me, 68 and if I asked you, you would not answer. 69 But from now on, the Son of Man will be seated at the right hand of the mighty God.”
it could be argued that those who spoke to jesus in marks account, 20 or 30 yrs earlier than luke's account died and never saw the mighty one coming on the clouds of heaven...and thats why luke's account is different...