It was City's 100th goal of the season in all competitions.
"So many things he can do as much as possible". "During the season you have these kind of games, you can not always be at your best level", he said of the performance.
"I don't remember if Ryan Giggs was like Leroy when he was 21, 22 years old".
It was a poor advert for the Premier League with Huddersfield, who look nearly certain to get relegated and who parted company with manager David Wagner this week, offering next to nothing as an attacking force. "I don't know. That would be the comparison, you know?"
"What we have done so far has been incredible, in the league and the Carabao (League) Cup", said Guardiola.
"I think everyone could see in the second half we played quicker, had better position and we controlled the game really well", the German said. "And of course still, he's not like him".
City finish the match four points behind table-toppers Liverpool, while Huddersfield remain firmly rooted to the bottom of the table.
"Straight red cards in the FA Cup mean a Premier League ban - and that is another potential danger for City to navigate if they make progress in the cup".
The club's Under-23 side are in the quarter-finals of the Checkatrade Trophy, a competition for professional teams in League One and League Two, plus invited academy teams run by Premier League and Championship clubs.
Two goals in as many minutes from Raheem Sterling and Leroy Sane took the game away from the hosts, though, as Man City responded to Liverpool's victory over Crystal Palace yesterday with a comfortable triumph of their own. One team has been better but we're in January and there's many more games to play.
Yet even so, Guardiola is happy with the idea of playing lots of matches if it brings plenty of trophies, and is not anxious that Premier League leaders Liverpool might benefit from a lighter schedule.
He said on Sky Sports: 'I'm never happy with these players, that's just to accept the reality. "If you play every few days then everyone is in rhythm but sometimes if you have a week or 10 days off then the rhythm might be wrong".
"What we can do is beat United when we go there".