As VV says: An aircraft operating the same route for several days in a row out of T5 means nothing really.
When BA had 2 services a day ex T3 about 8 years ago, they chose the MIA services because a dedicated B744 could operate each service and no towing was involved as an LHR-MIA-LHR return would take about 21 or 22 hours leaving a 2-3 hour turnaround before it started over.
Likewise when they operated longhaul ex T1 they chose NRT and JNB servces (2 each per day back then) as the arrivals and departures dovetailed neatly. JNB's arriving early morning, NRT's departing mid/late morning, arriving early/mid afternoon, JNB departing early/late evening. Again no towing required(*).
(*) obviously maintenance requirements would occasionally override this