We aren't lacking in talent. One of JK's biggest failures, imo, is playing guys out of their natural position. Fabian at LB, cameron at various positions, Bradley as a #10, yedlin as a rm/rw, the progression of CB's at LB, strikers out wide...puts guys in unfamiliar positions and sets them up for failure. We already don't have the most quick thinking players. Putting them where a split second more thinking needs to go into positioning, calculating passing lanes, etc, is enough to turn any tactical nuance into a failure.
Look at the Belgian team...chock full of world class talent...but always underperform defensively and in transition because they don't have proper fullbacks...And play guys line vertonghen out there.