If you watch the next game, you will see that, left or right, whenever the full-back has possession, there are a number of regular passes that the team try to make available (and therefore the full-backs are looking for). The first type is back to either centre-half (who drop back for the purpose), the second is up the line for the winger and the third is inside to either the deep midfielder, further forward to the attacking midfielder, or more dangerously to the centre-forward running back. We don't tend to play a long ball over the top for a forward to run on to, or to challenge for a header.
It is Edun's ball inside to the centre-forward, or the attacking midfielder that seem to get intercepted when he isn't on his game. Whether the direction is off, or it is under-hit, if an opponent comes onto one of these balls, they are naturally moving toward the D and pressurising our defence. These are the situations that look the worst, where we have to rely on the deep midfielder or the centre-halves to win the ball back.
It is clear though, that these are the balls that MA wants us to try and play, in order to switch play, open up a ball down the line, or just move into the next third. It seems to me that Edun is 'on message' and looks good when it goes right and a bit of a plonker when his first 5 passes go astray as they did against Posh.