Sorry Owlery, but I think that you are drifting into the realms of fantasy there!
It appears that BE have some short term, peak season shortfall in resources,(probably both aircraft and staff) so have outsourced one aircraft's worth of work to a third party, who specialises in this type of activity, as part of their business model.
Perfectly normal activity. Ryanair, easyJet and BA all do it regularly
Surely, if the sort of fundamental shift in the operational model that you suggest was in the offing, then it would be subject to some sort of Stock Exchange announcement or update.