Saying their best forte is a bit redundant because forte means what your best at or specualize in.
It seems that what he absorbs depends on the monster's best forte. That is being agility for the Fur monsters. Arthur was glad he picked this one as it was different from the Sins Dungeon.
On this day to keep the world safe from the world's worst dancing. Watase Toshi took one for the team as he was lectured by his sister for over an hour...