Christ has been given power over "ALL flesh..." (John 17:2) This is the surety of the success of Christ's ultimate work.
Note John 6:39, which says, "Now this is the WILL of Him Who sent Me, that ALL which He has given Me, of it I should be losing nothing." CV
The questions are: "How much did God give to Christ?", and, "how much of what God had given Him will He lose?"
The answer to question 1 - "ALL flesh."
The answer to question 2 - "Nothing."