I'll back him for now.. this can happen , Jones had also made a stupid tackle once or twice at our box... Jonny Evans was also mistake prone but cut it off only to lose all confidence and become so injury prone. Rojo has bgiger potential however his best position would be LCB in 3-5-2 I guess, he's no more than cover on the left for Shaw and not better than Jones, let him fight for that spot with Jones and maybe McNair, also put Blind in the mix and see what happens if any of the three can raise their game like Smalling did then we are good, there is a good competition right now and we should not rush into any decisions like buying some other CB unless some world class CB is available in the market, I mean we could try to get hummels or maybe laporte or we can actually give a go to one of our golden generation Tuanzebe/williams/CBJ, TFM as of next year or the year after if things are steady but Jones/Rojo have still plenty of potential and don't wrte of McNair with Blind who I in fact see as a back up for numerous positions...