I say for gv's, just I do for the aircraft, to fill in the gaps.
The M26 fills no gaps, and would see (almost) no use in scenarios. Now the M18, M10 (already have the chassis), variants of the M3 (needs a remodel, but we already have the chassis), variants of the 251 (already have the chassis), Panzer Mk III "J" (already have the chassis), T70, KV1, Churchill, Cromwell, etc etc., those all could provde scenario fodder and many of them could fill gaps in the AH gv set.