Nor sure if this a reply to my post, but I'm assuming it is.
You're right that if Ibra, and others, just ended up with the ball in the net a few more times, we'd have been much closer and probably would've ended up top 4.
However, Ibra massively exceeded expectations regardless, IMO. One gap between United and Chelsea and Spurs is that they legitimately have goal scoring threats throughout their squad. Costa and Kane are benefiting from teams having to deal with the other attacking threats in their squads. Put more succinctly, I disagree Chelsea and Spurs had "that player who turned a draw into a win" - they had players who turned a draw into a win.
For United, Ibra exceeded expectations, Mata did his job, Pogba did alright but can improve. After that, it was various degrees of underachievement from Mkitaryan, Rashford, Lingard, Martial. As for our defenders, a goal from them is like bird-watching and waiting for the rarest Valencian Red-Tailed Smallingbird, known to only appear twice yearly. I'm not buying some nonsense that Mourinho only wants his defenders to defend. At Chelsea, his fullbacks and centrebacks contributed goals.
To me, it's head in the sand to think all United need is new striker and we'll be there or thereabouts. I think some of this seasons underachievers will kick on next season, but unless we address some of the gaps in our squad, and start getting goals contributed from all over the pitch, we're probably not going to be in the title race, and we're not going to make a splash in the CL. I'm not saying we need major surgery, but hanging our hat on finding and bringing in a 25+ goal striker is dicey.