General Duo Lai seems to be quite some distance away from promoting his basic qualities to their absolute limit.
Generally, the gap between the Fourth-order Peak and the Fourth-order Limit is not vast.
However, at this stage, the strong cannot continue to strengthen themselves by absorbing Soul Power from Soul Sand. If they desire to continue climbing on top of this foundation, they must rely on daily strenuous exercise and the intake of various rare treasures.
Both of these avenues are energy-consuming and expensive.
Regardless, the enhancement is not very significant. At this stage, each improvement is equivalent to breaking limits. A Peak Strongman continues to break his limits repeatedly until he cannot progress any further and reaches his 'real limit'.
By this time, the Fourth-order Limit strongman is not necessarily able to meet the requirements of the 'Body Beyond Limits'.