2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142842We critically analyse and comment on the claims of M. R. Pennington and D. J. Wilson [arxiv:0711.3521]. Although we generally agree with their obvious algebra, it is clearly not applicable to our equations. Moreover, we argue that the corresponding proposal is not useful for production-data analysis. The advantages of our approach, which involves complex yet purely kinematical coefficients, are summarised.7 pages plain LaTeXHigh Energy Physics - Phenomenologytext