The JK solution never requires more logic than either the SR or the T. Comparing the maps for the SR and the JK solutions, we see that both maps have 1’s in exactly the same places. Further, all of the X’s in the SR solution are also X’s on the JK maps. The JK maps have additional don’t cares. We could always choose to make those don’t cares 0 and arrive at the SR solution. But, as we saw above, some of those X’s were useful to make larger groupings and thus simplify the logic. From a different point of view, say we were to design a system for SR flip flops and build the combinational logic. If we then found that all we had available with which to build it was JK flip flops, we could use the logic and it would work. Similarly, if we designed for T flip flops, we could connect that logic to both J and K; the JK flip flop would behave like a T. (As in the case of the SR, there is often more logic required this way.) The