The midfielder nicknamed Diego served up a truly outstanding display against title-challenging Rabs, yet he flatly denied deriving any special satisfaction from netting against his former club and preferred to talk up the contribution of his Lok team-mates.
The 31-year-old said: "It's always pleasing to score, but I'd have been much happier with a blank against my name if it meant we had taken all three points.
"Anyway, I'm only able to get into forward positions and back up our front players because of the covering work done by Gints (Brian McGinty) and Ross Hepburn so I look upon my goals today as a team effort.
"I had a disappointing start to my Pollok career but now, thanks in no small part to the guys around me, I'm more like my old self and feeling a lot more confident so hopefully there is better still to come."
Diego's first major contribution came towards the end of a keenly contested opening 45 minutes when he raced forward to receive a Willie Sawyers lay-off and rifled a low 20-yard shot beyond Rob Roy goalkeeper Stephen Robertson.
The visitors were arguably unfortunate to go in a goal behind. However, it looked from the outset of the second period that Rabs co-gaffers Jimmy Lindsay and Freddie Frye had dished out a few stern words.
Their attacking pressure told just after the hour mark when a disputed throw-in led to the ball reaching Willie Easton whose 18-yard shot took a wicked deflection in nestling behind Lok keeper Stevie McNeil.
This slick-moving Rob Roy side were now living up to their pre-match hype and it looked like they had killed off the homesters in 82 minutes when Chic Connolly expertly tucked away a penalty kick awarded after Lok sweeper Peter McMahon felled Stevie Meechan.
But they had not bargained on a last-ditch Pollok attacking sortie winning a corner kick that led to a sclaffed clearance that Diego acrobatically volleyed high past Robertson from around 12 yards.
The final spotlight in what had been a footballing spectacle fell upon over-officious whistler Nick Walsh who somehow saw fit to send off Easton for an injury-time tackle on Hepburn that warranted a yellow card at best.
Rob Roy co-boss Lindsay said: "Whatever happened to common sense refereeing?
"John Richardson and I thought the game was played in a great spirit by both teams, but six yellow and one red card give the impression of a mini-Donnybrook and demeans the Juniors."
Dugout ally Frye was disappointed to have conceded McQuilken's second goal so late in the day.
He said: "All we had to do was defend a corner kick, but we weren't focused enough on doing that and paid the price."
The Kirkintilloch outfit dropping two points was matched by second placed Petershill who only managed a 0-0 stalemate away to Shotts Bon Accord.
These twin failings allowed Super Premier frontrunners Auchinleck Talbot to open up a five-point gap on the chasing pack with a 5-1 Beechwood Park thrashing of Clydebank.