Similarly to the model of his arch rival Star Saber, Deathsaurus is modelled somewhat in a way that parts from his Robot mode are shared throughout his alt mode and his Brestforce partners, with the latter being able to do so more than the former.
Both Tiger Brest and Eagle Brest can fold up and be placed on Deathsaurus' chest when not deployed, however the nature of his Kaiju alt form compared to his robot mode in the Victory cartoon source material didn't allow for most parts used to be utilised in both forms, but for what it's worth, most of the attention to show accuracy details was prioritised is a great trade off, and I learned how to generate Rigify rigs from scratch for his Kaiju mode!