Last year's victor Egan Bernal, having dropped out of contention when he was distanced on the Grand Colombier on Sunday, was again off the pace and rode home in the grupetto alongside the sprinters and other stragglers down the mountain, at least managing to smile and joke as he did so.
Lennard Kämna of Bora-Hansgrohe, pipped to victory on the Puy Mary on Friday, has won Stage 16 of the race at Villard de Lans today after attacking on the day's final categorised climb and riding away to victory.
Bernal had said that compensating for his back led to some discomfort in his knee.
The main group of contenders, happy to let a 23-strong breakaway have their fun up ahead, rolled in more than 17 minutes later, with Roglic and second-placed Tadej Pogacar locked together to maintain the 40-second gap between them.
"I have the greatest respect for this race and I am already looking forward to coming back in the years ahead". His team said Bernal will try to recover as quickly as possible and redefine his goals for the rest of the season.
Brailsford said: "We have taken this decision with Egan's best interests at heart". "Egan is a true champion who loves to race, but he is also a young rider, with many Tours ahead of him".
The 2020 Tour de France continues with the brutal 170km stage from Grenoble to Méribel (Col de La Loze) - the highest point of this year's Tour.
Bernal began the Tour still suffering with a back injury that forced him to withdraw from the Criterium du Dauphine last month, but had played down the problem until his collapse. The traffic-free pass between the ski resorts of Meribel and Courchevel was opened to cyclists this year after a forest track was paved by local authorities. The last six kilometres of the climb are particularly hard, with very steep sections and sharp turns.