Did Pandavas truly complete 13 years of exile?

Another seeker asked… ———– My arguement in the last part of Virata parva is this. If Bhisma calculated using the concept of adhikamaasa that the Pandavas had the exile period five months earlier than the Uttara Go grahana, then Kichaka vadh/Draupadi’s harrassment 15 days before that was not needed. Also why didnt Bhisma say this…