and Yeck is injured... that makes plenty of room for them to be starters. Yeck was already getting beat out by him anyway. And Koroma wouldn't be running with the 1's day after day if it was just motivation. With Koroma it seems his play has never been an issue at all. Just needed some time to get used to things. And Lapuaho has been highly regarded since Bronco brought his name up in the spring.
And like someone said below, Kanuch could also be starting. I don't think it's any reason to lose confidence. They might just be THAT good. Either way, Koroma is 2 deep at min since Fusi is no longer a C. And someone has yet to step up and perform better than Lapuaho.