Nah, could've worked in 2-3 ways.
1. Could've jus had more conduits on that bus (I mean why would only 3 prisoners be transported on a busy anywayz).
2. Could've simply had some that weren't found yet (apparently that was going on in game with the folks that were being locked in those storage cells on the street, + the conduit finger check and the other detained conduits within those storage containers getting freed up later in the game).
3. Could've had another person/s outta towner conduit coming into Seattle on a similar expedition as Delsin.
1. that could've worked
2. those people locked in the containers either weren't conduits (just assumed like the cats in the jackets) or they didnt know they were until those scanners, so they wouldn't have had powers....
3. that could be next game...cause I think that's what happening with papertrail....the people so far have been killed with different powers, but the only conduit we know of that can do that is delsin...could be setting up the introduction of the next major enemy...