Yesterday (January 10), the official "Blue Route" officially released an announcement announcing that the "Combat File" entry is being updated, and some characters will permanently return to regular construction, as follows:
Light Construction Pool Resident Added: Vincenzo Gioberti (Elite).
Heavy Build Pools are added: Bora (Ultra Rare), Zara (Ultra Rare), Littorio (Ultra Rare), Giulio Caesar (Elite).
Special Build Pool Resident Added: Fearsome (Ultra Rare).