It may be that the glottalic consonants were preglottalized or that they were ejectives that became preglottalized in Italic and Balto-Slavic before losing their glottalization and becoming voiced.
Podería ser que as consonantes glotais fosen preglotalizadas, ou que fosen exectivas que se volveron preglotalizadas en itálico e baltoeslavo antes de perderen a glotalización e de volvérense sonoras.