FWIW, Dan Martin said almost exactly the same as Fuglsang.
http://www.cyclingnews.com/news/tour-de-france-dan-martin-warns-of-fireworks-to-come-after-cautious-stage-to-epernay/
It's possible/arguable, even probable, that Alaphilippe on current form couldn't have been caught, and anyone that could have followed him would have just been outsprinted at the finish anyway. But the fact is, any rider who could have caught him has more important things to worry about than just picking up a few seconds on stage 3. It's true for Fuglsang, it's true for Martin, Thomas, Bernal, Pinot, etc. Alaphilippe's Tour is already a success now, no matter what happens on PdBF, whereas the Tour only starts on Thursday for the others.
http://www.cyclingnews.com/news/tour-de-france-dan-martin-warns-of-fireworks-to-come-after-cautious-stage-to-epernay/
"Martin explained why the overall contenders raced cautiously, allowing Alaphilippe to win alone and take the glory and the yellow jersey. They are playing a much longer game.
"It’s very early to be making big efforts like that as a GC rider. With so many teammates around, if you do make a move on a finish like today, then other teams will chase you down, we saw that with the move by Landa and Woods," Martin explained with a true Grand Tour race mentality.
"This a very hard and mountainous Tour," he said. "You also feel that anything can happen in any moment, so I think people are more and more conscious that using up unnecessary energy so early could be very costly in the final week, especially with those last three days in the Alps. Say that, but you hope everybody doesn’t wait for the Alps because it could be too late."
It's possible/arguable, even probable, that Alaphilippe on current form couldn't have been caught, and anyone that could have followed him would have just been outsprinted at the finish anyway. But the fact is, any rider who could have caught him has more important things to worry about than just picking up a few seconds on stage 3. It's true for Fuglsang, it's true for Martin, Thomas, Bernal, Pinot, etc. Alaphilippe's Tour is already a success now, no matter what happens on PdBF, whereas the Tour only starts on Thursday for the others.