The testimony was that it was said a stones throw away from the disciples and that it was at the end of the prayer they were found asleep.
Do you think mark (and Luke) lied or do you believe people filled in testimony later?
I was being facetious, I think that its possible to interpret that remark in that but I dont believe that Jesus would have had to capitulate and be humble to God's will quite like that, he was afterall part of the trinity so it seems like he was having a battle of conscience instead, like "OK, time to nail the colours to the mast on this one".