I have a question for you all. If I have an OB on cold one and e has joined a unit of saurus, can he still make way for positioning or challenges ?
Since his base perfectly fits inside of a saurus unit, replacing 2 rank & file, the OB can freely move within the unit to make way and get into contact with the enemy (p. 98, 2nd para under different sized bases & p. 100). This is not the case if he were attached to a skink cohort since he has to remain on the outside of the unit as his base would be irregular compared to the unit itself. P. 100 has more details including pictures.