Absolutely. Imagine if we gave high jumpers the credit for mis-placing their take-off foot. Or sprinters got measured on the speed from actually setting off to crossing the line, rather than from the gun.
The rule is, you don't foul the board. You could be a 10m long jumper, but if you foul, you haven't completed a successful jump. Having the mental capabilities aligned to peaking your physical capabilities on both qualification days and finals days is part of the the skill of a good / great long jumper. Greg has consistently shown this to be a great strength of his, and he has reaped the rewards from it.
He doesn't seem to have a monster jump in him. But then, others don't seem to have the technical and mental abilities to beat him on the biggest stages. That makes them losers, and him the winner. They need to deal with that.