As long as Roan didn't get too close to one of those Saint Realm guys, their Divine Senses wouldn't pierce through the Divine Sense bending skill. With that being said, he could stay hidden as long as he wanted. Then again, Roan wasn't the type to simply watch, so once one of his clones was destroyed, he immediately summoned another one.
Since it could use the same skills as the original body, it could also hide and appear once it got close to another group.
Suddenly, Roan's Death World appeared around another group, which immediately caught everyone's attention.
"There he is! It's that skill he used in the Soul Power Competition!"