It would be interesting to see the stats, but I reckon Cummings got forward a bit more when Kebe was injured and out of the side. Kebe has also made a marked improvement this season in his tracking back, but if Cummings overlapped too often, I really think we'd get caught out down that flank.
And as much as I'd love to see Connolly sign permanently, he's not going to overlap much either.