The match against Southampton at the weekend should be an easy match for Manchester United, considering that Southampton is currently in a bad condition after consecutive defeats, but we also cannot guarantee that Manchester United will win easily in this match, because the strategy often implemented by Ten Hag in a match actually became a Boomerang which destroyed themselves like when they faced Brighton in previously match.
Southampton has 3 consecutive league losses, but Man United has two, and they're playing in Southampton. So looking only at the current season stats, it's not clear if it will be an easy one for Man United.
I expect Southampton will focus on defence, knowing how desperate Man Utd will be for a win, and then will be looking for quick counter attacks and I wouldn't be much surprised if they manage to get 3 points.
Ten Hag's team demonstrated last season that their attacking power is very poor for a club aspiring to be at the top. This season is even worse with only two goals scored in 3 games. Luckily Southampton is even worse, with 1 goal scored, so maybe a goalless draw would be a good bet?