I expect Crechman saw nothing, like most of the people around that night. The Carpenters left the Tapas complex between 9.15 and 9.30pm. Somehow they failed to see Gerry returning, Jane leaving or returning or Matthew and Russell leaving or returning..
http://www.mccannpjfiles.co.uk/PJ/STEPHEN-CARPENTER.htm"Between approximately a quarter past nine and half past nine we left the Tapas bar to go home, we walked across the MW reception area, crossed the road and a semi circular path to return to the apartment,.."
There is a period after Jane has returned that things like this could happen.
Consider what I say in this posting:http://miscarriageofjustice.co/index.php?topic=7805.msg370491#msg370491
"He is bound to get something right if he allows time ranges like this! "The time of the encounter given by Jez is between 20:45 to 21:15." What do these times mean the start times or the period it fell within? Like did it finish before 21:15 or could it have started as late as 21.15?
Even if he started as late as 21:15 he only talked for 3-4 minutes then went home didn't he, arriving home at 21.30 Well even allowing 5 minutes for getting up the lift, that means he has to account for between 10 - 40 minutes depending on his times, doing something else doesn't he?"
If Jane sees Crecheman as SY has determined, Crecheman has to be passing at the same time as Jane, so when was that? Were Gerry and Jez still talking at this time?
I fear it isn't Rob, rather, the person or persons culpable in her disappearance as evidenced by SY's actions over the last few years.
Sorry but I don't understand your implication as yet. Do I sense you think they know who is involved, like some websites suggest, but can't do anything about it?
If you can find the person responsible it would be a good starting point.