*Sigh*
Commisars make very little sense as written.
We know (from Cain's Last Stand ) they are trained in intelligence analysis and various counter insurgent principles.
We know they must have some tactical training, since every commisar in the novels seems to be a highly skilled tactician - indeed they'd have to be somewhat familiar with tactics to even fulfil their jobs. Yet from their advancement possibilities, they are about as clever as a bag of rocks, and so only about 10% smarter than the average Ork.
Atleast they got fellowship instead of stregth, finally.