Rubbish. You are making a lot of assumptions about how the race would have played out. Perhaps it might have been two lengths if it had drawn 6 (which the winner did) instead of 10.
As @Joe Bloggs said - two options pull back to last, risk the horse fighting you, then hope you get the gaps or be out in the car park turning for home. Second option use the gas and push forward for the lead hoping no one takes you on and that you can tough it for the rest of the race.
He chose a third option - accepted he was planted three wide, hope someone moves forward to give you cover or relax the horse and conserve energy as best you can.
Getting stuck 3 wide happens all the time at Ellerslie over 2000m.