Soviet/Russian BMP-2 discrepancies

[PPoS]

Don't know if this was deliberate or not, but I was looking through the data of the different BMP-2 versions when I found something that seems a bit odd. All the BMP-2 versions have a Crew of 2, even the earliest one (1979). It should have a crew of 3, unless the Kliver turret was available back then (was it?).

Oh and another thing about the BMP-2M (Unit 788); it's armed with a 100mm 2A70 gun. Is this correct ? I cannot remember anything about that, I thought the "M" upgrade was basically adding the Kliver turret with 4x ATGM launchers + AGS-17, and a stronger engine. And the "Berezhok" version being a further upgrade to that (which it seems to be in the game). For the BMP-2M a crew of 2 seems to be right though.