To keep this simple, Amrabat isn't a left back, he only played good in the cup because he wasn't challenged for the first 45mins and effectively played as a midfielder. You will say the difference is Hannibal, I will say Crystal Palace was weakened and not interested in winning the game so let's agree to disagree as neither of us can prove the point.
Crystal Palace were interested in winning the game until they weren't. As outlined in the OP, we played our hand in dissuading them. I had reservations about the game beyond the point they stopped contesting it, but that doesn't and shouldn't negate how or why that came about.
Teams like Palace don't go into cup competitions to throw them outright, but they do make calculated assessments on whether a game is worth going for or not at key junctures and that is what we affected.
Point can be dropped, but it's still one worth making.
I agree with midfield being THE issue. However, I just don't see how Hannibal is the solution to it. For me he's just another 8/10 hybrid as we already have 3 of those. He played against Burnley and we were lucky to get anything more than a draw from this game. We actually looked better in possession and created more chances (based on xG) and limited CP to less chances than Burnley. So how did we come to a conclusion that Hannibal is the missing piece here?
Again, OP mentions that without Fred, the only player who can start from a high midfield position and press hard and effectively
backwards is Hannibal.
It's pretty clear what the intention is with Mount and that he is an exceptional front-foot presser who can aggressively cordon whilst waiting assistance, but he is not the guy who can track ball carriers and breachers who beat the first phase of a press and are then on their way into the nitty gritty of an actual CM battle, absolutely neither is Bruno who himself is much better going towards the man higher up the pitch. Theoretically, you can see why a portion of this two #10 business might work. On the other hand, the immediate concern it leaves Casemiro with far too much ground to cover and shore up is the crux of this paragraph; it's because both of the players mention don't excel at tracking runners or going deep into midfield doggedly pursuing a man. More specifically, it's the role of a midfield runner, which neither of them are.
Hannibal ushers ball carriers into covering midfielders. Actually, better to say, the midfield runner does that by default. It's not a new role, we're just inherently dire at it as a squad to the point of: if not Hannibal who else can do it to the standard the league demands?
Anyway, back to midfield. Amrabat goes back to play alongside Casemiro. One of Mount/Bruno plays #10, the other one goes RW. We pray this works. I don't see any other way. And then, if we're winning, and opposition is trying to win midfield battle and is forced to attack, Hannibal makes sense.
I don't disagree with this, but in the here and now, we still have games to contest and holes in midfield to shore up.
He is not a solution for a game that we are forced to play in possession against low block.
What I feel your post is missing is appreciation of how you keep a low block a low block and actually hem your opponent in and kill their attempts to breach in bursts.
You make it sound like Palace faced an onslaught and we just couldn't break them down. The reality is, they scored and shelled up and then picked their moments to break out and caused us all sorts of problems leading to Casemiro walking a red card tightrope and Amrabat looking new and shocked by the pace of the league. Amrabat wasn't toasted just as a FB, he was struggling in midfield itself and was not accustomed to having so little time to sort himself out, that is exacerbated when the players breaching the lines have no concerted pressure on them to hurry their play along and make them think and act quicker than they'd like.
You don't just want high possession stats. By itself it means nothing as teams often cede possession to play a low block. What you want is that the pieces of possession the opposition manage to have are as disordely and unsettled as possible, disrupting their actual plan and genuinely heaping pressure on them, which often leads to lapses in concentration and eventual openings that are clear cut. We rarely reach that state and it's something we are behind a host of teams for this season, so the point is what we do in the here and now whilst we're losing games and playing really poor football on
and off the ball.