Spectral average of the 91bg-like SN Ia (black) at epoch of maximum light (−2 < d < +2) compared to the spectra of the five 91bg-like SNe Ia identified on the Branch diagram (see, Fig. 8) in the lower regions with low pEW values, where the two Si IIλ5972 and λ6355 spectral features of these spectra are clearly affected by host galaxy contamination and/or low spectral resolution from the instrument causing inaccurate measurements of these absorption lines.