  We provide arguments for the use of the rational form of unitarization, its
relation with the diffraction peak shrinkage and asymptotics of the inelastic
cross--section.
  The particular problems of the Regge model and the exponential form of
unitarization with a factorized eikonal are discussed as well. Central role
belongs to the asymptotic amplitude factorization resulting from Mandelstam
analyticity and its symmetry over the scattering variables.
