Yes, Jesus did fall, and someone else was made to carry it for him. But, Jesus was also beaten, he was losing blood, with all the torture, he was already tired, lacked sleep.
My point is a 6" x 6" – 4 foot beam is much lighter than a 6" x 10" — 24 foot beam. One man can lift the cross beam and carry it with difficulty, but it can be done. But, even a weight lifter would have a hard time lifting the “torture stake” of 6" x 10" ---- 24 feet long. Go to Home Depot and try it yourself. Basically, very few people would be able to lift and carry the so-called torture stake.
And, after what Jesus went through, the bleeding back from the 40 lashes of the cat tails, I doubt anyone would be able to lift within carry the so-called torture stake.
Preparations for the scourging were carried out when the Prisoner was stripped of His clothing and His hands tied to a post above His head. It is doubtful the Romans would have made any attempt to follow the Jewish law in this matter, but the Jews had an ancient law prohibiting more than forty lashes.
The Roman legionnaire steps forward with the flagrum (or flagellum) in his hand. This is a short whip consisting of several heavy, leather thongs with two small balls of lead attached near the ends of each. The heavy whip is brought down with full force again and again across Jesus’ shoulders, back, and legs. At first the thongs cut through the skin only. Then, as the blows continue, they cut deeper into the subcutaneous tissues, producing first an oozing of blood from the capillaries and veins of the skin, and finally spurting arterial bleeding from vessels in the underlying muscles.
The small balls of lead first produce large, deep bruises which are broken open by subsequent blows. Finally the skin of the back is hanging in long ribbons and the entire area is an unrecognizable mass of torn, bleeding tissue. When it is determined by the centurion in charge that the prisoner is near death, the beating is finally stopped.
I am saying that one would be able to lift and carry the crossbeam, but very few if any would be able to carry the so-called torture stake. Add to that Jesus’ depleated physical condition from the tortures, mockings, lack of sleep, no food, then even the crossbeam becomes difficult to carry and it is no wonder someone had to finish carrying the crossbeam for him.
Go to Home Depot, find a 6" X 10" X 24 foot beam ( or even a 16 foot since that is more common ) and inquire what the weight of that beam is. Try to lift it yourself.