i think if AH is gonna split the arenas into different time periods then the correct GVs need to be put in.
some examples would be
a T-34/A model wouldnt be in a late war arena the T-34/85 was brought into production in 1943 . By the end of 1945, over 57,000 T-34s were built: 34,780 original T-34 tanks in 1940–44, and another 22,559 T-34-85s. chances are in the late war you saw a t-34/85 then a t-34/76
a PzKpfw IV Ausf H wouldnt be in a early war arena cause it wasnt put into production til dec of 1942 almost 1943 and the model J was in production early 1944 to the end of the war
the m-16 MGMC shouldnt be in the early arena. The M16 MGMC was standardized in December 1942, with White Motor Company beginning production of the vehicle in May 1943. White Motor Company would produce 2,891 vehicles - of which 568 were converted earlier M13 MGMC half-tracks.
m-8 shouldnt be in early war. Over 8500 M8's were built between 1942 and 1943
all the LVTA's were not around till late 1943 .. .. so they shouldnt be in early areana either ..
any more examples are welcome