The Frenchman put the Red Devils 1-0 up against Everton before half-time as they went on to win 2-1 at Old Trafford.
José Mourinho praised the performance but still bemoaned a lack of ruthlessness before goal - blaming Romelu Lukaku and Marcus Rashford - and a leaky defence.
The ball was swept wide to Martial on United's left where Walcott had failed to provide cover and the forward had time set himself and then whip a curling, low shot beyond Pickford's dive and inside the far post.
United returned to winning ways with a 2-1 victory over Everton at Old Trafford with Pogba putting in one of his better displays this season, bagging a goal and an assist.
United negotiated a nervy finale, but they could have had another goal when Martial was played clean through on goal only to be denied by Pickford.
But replays show that Gueye did touch the ball on the way through, which Souness and Redknapp point to as a reason for the penalty to have not been given.
The 12 young soccer players whose rescue from a Thai cave in July captured an global spotlight attended a Manchester United match and met several of the players this weekend.
"We don't have the killer instinct that I would like".
"For us it is nearly an impossible mission to keep a clean sheet even with the phenomenal goalkeeper we have and to score goals is really hard for us". "He's got that good of a penalty, he's got that power in it, so you've got to go a tad early".
The Belgian striker last found the net in a 2-1 win over Watford in September - his fourth of the season - and his run of eight games without a goal has coincided with a hard spell for United.
Bernard passed up a chance to drag Everton back into it before Smalling's tackle enabled Sigurdsson to grab a consolation from the spot in the 77th minute.
"We came here to win the match, we played well and until that moment, the penalty, they had one chance, we had one chance". Even if he doesn't score, to create what he is creating, it is a solid performance for the team.
He said: "He took quite a long time to understand what we want, quite a long time for his brain and body to be ready for how we want him to play".