"What puzzles me at the moment is the fully deployed right wing (Nr. 1) thrust reverser. At which point during the event was the T/R activated ? It obviously had time enough to fully deploy, which for a translating cowl design driven by spindles should take a little time,"
On wheel spin up, #2 does not deploy until ground prox is made with NLG compression. 526 had prats on her, this means hydraulically actuated reversers. Not really important, even if deployment is a bit quicker even with wormgear actuation it is still only a few seconds.