Very unexpected.
I never imagined Manchester United would lose against Grimsby Town, I thought even they draw, they can still win in penalty. But, it's not work like expected, Onana once again making his own mistake which lead to goal.
I think the person should be blamed in this match is Sesko and Onana, Sekso is just a hype player, but give zero contribution to Manchester United.
Grimsby Town, which the market value is just
3.6 Million Euros beating a
887 Million Euros team, 3.6 Million in Manchester United not even able to buy one player.

Grimsby Town is the fourth tier of division and just watching how a full grown team like Manchester United having to fight for a draw and at the end, they lost to this particular club. Manchester United is finish if you're to ask me because I see absolutely no reason why Manchester United shouldn't pull the significant odds and win this particular game. Who to blame for Manchester United getting knocked out of the Carabao Cup? The manager for his inappropriate starting XI or the goalie for making crucial mistakes that led to goal?
Benjamin Sesko is new to the club and he's slowly adapting, remember how toxic the fan base of the club can be, always expecting electric performance from new players and putting these players under pressure. The Red goalie, Andre Onana will become an eligible member when he's ready to accept defeat and work extremely on his mistakes.