In the BattleTech novel The Sword and the Dagger, it is really revealed that Hanse Davion, the First Prince of the Federated Suns, has been replaced with an impostor simply because the impostor are unable to pilot Hanse's own Battlemaster, considering the fact that the neurohelmet a mechwarrior wears to give their mech balance has to be meticulously calibrated to the mechwarrior's brainwave sample.