Depends on the levels of confidence in kopek you'd think. As good as the horse is and assuming he's schooling well and doing everything right at home, it'd still be hard to be totally confident in a horse running in the arkle after one trot around in a beginners months earlier. They might decide to run a few back ups.
Would be no harm tactically either, if kopek is the faster horse than lulamba and gets first run on him, and lulamaba gets a little outpaced for a moment when they quicken, it might be a good idea to make sure he has to navigate as much traffic as possible when coming with his run.