The counterexample (because math is fun ) is three pieces, 5, 9, and 9 kN, with a fall force of 18 kN. If all pieces are equalized statically, the 5 fails but the fall is held by the two 9's. Equalized dynamically (magic X) the 5 fails, and the two 9's take 18 kN plus whatever extra force is generated when the magic X extends, possibly overloading the 9's and RIP.
Does anybody know how much extra force is actually generated when a magic X extends?