Gibson returned on April 1 and made 34 saves in a 4-3 overtime loss at the Edmonton Oilers, allowed one goal in a 3-1 win against the Calgary Flames on Tuesday, followed by his shutout against the Blackhawks.
His goals-against average (2.22) ranks fifth in the League, and his .924 save percentage is tied for fifth. Gibson's six shutouts rank sixth in the NHL, three behind league-leader Braden Holtby of the Washington Capitals.
Ducks defenseman Hampus Lindholm, out with an upper-body injury late in the regular season, thought the break during the season could help Gibson for a potentially long playoff grind.
"He was out for a bit, but I don't think he was out forever," Lindholm said. "I heard him say it's not like you forget how to play hockey coming back. When you come back from an injury like that, you feel fresh. You feel better. I think he feels confident.
"I know myself, if you come back from injury and it's healed, you usually feel fresher and more ready to go."
In Gibson's absence, No. 2 goaltender Jonathan Bernier went 10-1-2 in March with a .941 save percentage. Gibson didn't have to rush back and Maharaj said they spent a lot of time during his injury layoff working on technical aspects.
"If you over-structure a guy like John, then you end up restraining what he does naturally," Maharaj said. "Again, I think that speaks to the great instincts he has. He can come back in and just rely on those instincts to play.
"Whereas I think a lot of goalies that rely solely on technique need to have that time to regain the technical form."