"I think they're two of the best centers in the world," Thornton said. "They both won Art Rosses, Hart Trophies, Stanley Cups, so we definitely got to be aware when they're on the ice."
The Sharks had a full practice Friday and will skate again Saturday morning in San Jose before traveling to Pittsburgh.
Sharks forward Matt Nieto, who hasn't played since Game 6 of the second round against the Nashville Predators because of an upper-body injury, practiced Friday and took some contact for the first time since being injured.
"It felt great to be back out there with the team today," Nieto said. "Doing some contact and it felt really good. That was huge. I've been shooting the puck fine and passing and moving great. So to take the next step was a good feeling."
Nieto said he expects to be available to play at some point in the series, but he did not skate with any of the top four lines.
"Everyone wants to play this time of year, and to be watching from the sidelines wasn't fun," Nieto said. "But the team took care of business. They just played really [good] hockey, and it gives me a chance to try and get back in."
Thornton and Sullivan played together with the Boston Bruins during the 1997-98 season, and Sullivan was his coach in Boston in 2003-04 and 2005-06.
"Great teammate," Thornton said. "I remember when I was 18, 19 years old, just a tremendous teammate, and yeah, he's got the boys working over there. He really turned them around. They were kind of sputtering a little bit, and he comes in, he gives them an identity. It's really worked for him. Very effective coach."