There's mounting evidence that indicates easy/moderate ‘active’ recovery work and low intensity. If you want to get improve skill acquisition concurrently with increases in strength, power AND endurance the simple answer is to train more, just not ALWAYS with intensity and to ensure that you recover sufficiently. These lower intensity aerobic base focused workouts will allow you to do exactly that.
There are a number of underlying factors which are important to address for all aspiring BJJ athletes, regardless of the level at which they compete. The importance of addressing these issues is magnified for those athletes competing at higher levels, and, gone unchecked, they will almost certainly lead to injury, burnout or at best, reduce your longevity and efficacy as a competitor within the sport.