Given that Crossrail appears in RealTimeTrains, unlike the tube, I assume it is going to be part of the regular National Rail timetable and journey planning systems. Does that mean that journey planners will allocate you to a specific Crossrail service, which according to RealTimeTrains will take 10.5 minutes for a journey from Liverpool Street to Paddington?

And hence will the time for a Liverpool Street to Paddington connection be reduced from 55 minutes to a minimum of 40.5 minutes (2 * 15 minutes at each end, plus 10.5 minutes journey time), assuming your arrival time in the first terminal is exactly 15 minutes before the departure of a Crossrail service? And perhaps a couple of minutes longer on average because the arrivals/departures won't always match up perfectly, but Crossrail will be frequent enough that you'll only ever be waiting a few minutes at most?