TFM's defending one v one is brilliant at fullback. His performance against Leroy Sane was evidence of that. To say he can't defend is a myth when @Rozay has provided ample evidence for his performances in the EPL and for the Dutch NT. But it's no surprise people have given up on him after his short stint at Fulham.It's been a while since he was in the Ajax academy. He's not developed. Positional sense and decision making is still miles off the required standard. Not saying he cant get better but it seems unlikely that he will suddenly improve enough to be at the level we need.
I've absolutely no idea about Koulibally. I never saw him play before the last couple of seasons. Is there many examples of players suddenly learning to defend after never being able to do it before?
But having said that. I understand where @Rozay is coming from when he compares him to the very defensive AWB. I'd rather sign a more attack minded RB for sure, like a Cancelo or even the unproven 19 year old Max Aaron who are both very good going forward.
Having two defensive fullbacks would be detrimental to our attack imo. If we can't sign a attack minded fullback, then save the money and play the likes of Ethan Laird and TFM.