Mount isn't fully fit, and his other option is Zirkzee.
SAF, unlike Amorin, always had a deep squad of options and SAF liked to carry 4 legit strikers in his squad-- so he always had the opportunity to bring on fresh legs in the rare times that United were trailing.
I don't blame RA for looking at his bench and going-- well, either bring on Zirkzee or leave Sesko on and deciding to leave Sesko on. Zirkzee has 3 goals in 36 EPL appearances. Not exactly the same as SAF bring Ole or Sheringham off the bench for Yorke or Cole.
People need to get to grips that a.) the team needs help in the starting XI and b.) the team really has no depth except in a couple of positions.
RA's hands are tied to a degree. SAF, barring a couple of years, always had a standout CB pairing, so he could always gamble by adding a defender-- or my personal favorite, when he would put Giggs on as a "left back" in essence going 3 at the back. United can't keep clean sheets with 5 at the back. RA has to be a bit more pragmatic than SAF because he doesn't have the same horses-- not in attack, defense, goalie or midfield. It's a lot easier to take off a defender for a striker if you know your back 3 is Evra, Rio, Vidic-- because they are elite players.
17 points, 1 point behind second. Even after being screwed in the Arsenal game-- missing penalties in 2 other games and having a ball cleared off the line at the end of yesterday's game. Doing so with 1 striker who is young and is getting his first taste of the EPL. I'm not bored to death watching this team like I was under ETH and at least we are back to creating chances.
Lots of positives and most of the negatives are related to the squad which can't be solved in 1 summer transfer window-- it will take multiple windows to get a squad that has the depth that SAF had when he was managing.