I think you're barking up the wrong tree with this one.
Leaving aside United's rich history with Irish players (North and South), to state that Coleman would be playing for them if he was an England international is just silly. For example, they were linked for some time with Leighton Baines and didn't move for him. This was despite the fact that the left back position had become a cause for concern for a season or two before Patrice Evra was sold to Juventus. Even though the club has spent enormous sums in recent times, I'd suggest that cost and overall value for money were major deterrents in both cases.
I know they paid a similarly high figure for Luke Shaw, but I suppose the logic there is that if he fulfils his potential then he'll occupy the left back berth for 10 years or more. Fellaini's a midfielder and was a panic buy at that, so the comparison isn't really relevant.
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