100% they can. Shaheed in particular looks SPECIAL this year... his routes, his understanding, the angle of his breaks. He's playing at an all-pro level for what he's being asked to do (Olave is still the man and the more complete WR--just considering how Shaheed got here, his play has been extremely impressive).
One thing this system--and it seems, Kubiak's philosophy--is that it is ALL ABOUT getting the best players on the field. There are far fewer 3 and 4 WR sets (10 and 11 personnel)... it's almost exclusively 21, 12, and 22 personnel, and very little rotation. Olave and Shaheed are taking the lion's share of snaps. Has any other WR had a target in these first 2 games?