Muttley
Kasey Keller
That is the way i see it as well, Spence has done well but he has made mistakes the same as our other FBs.
As Deano says, he's been lackadaisical at times but really good in others. Mbuemo springs to mind as his best defensive performance.
I'm not writing him off because he plays for a manager who has no respect for clean sheets. I can imagine all 3 of our senior full-backs would cross that white line with a different mentality in different circumstances. Then we would see how good they are.
I also remember Walker going up another level when he moved to City. Pep didn't want him sprinting up and down the touchline all game. He let him become a great defender and use more intelligence and the surprise element of his overlaps. However, he was reminded constantly that his prime responsibility was as a defender.