Fundamentally it raises the question of how many fighting vehicles are meant to be in the platoon (in the real-life OrBat). Number of 29 tanks suggest two companies of 14 plus 1 in BG HQ - and that in turn implies 3 platoons of 4 and 2 tanks in company HQ (or 4 platoons of 3 tanks, Soviet-style, but in that style there would be just 1 HQ tank). On the other hand, Your OrBat for the Armoured Brigade 90 (which, I assume is also taken from original sources) gives 20 tanks per battalion, which gives typical Soviet-style company of 3 platoons of 3 tanks plus commander's vehicle. So it's essentialy impossible to extrapolate anything from this in relation to mechanized infantry.
Ok, thanks for Your effort and explanation. I suppose that without further source material not much more can be guessed and we just have to take it all for granted.