Well I guess I'm the only responding to this so I will continue to have this conversation with myself

Now that I took a big boy pill I get the size of GCV - I believe both Ken White and Wilf (as well as others) have posted that vehicles that are designed to operate/complement the MBT needs to be built like a tank and the GCV design by BAE seems to meet that requirement at 140,000 pounds. I do wonder about the gun size, but I have a feeling that the future Armored Brigade Combat Team (formally the HBCT) will be designed like the current SBCTs with three battalions of GVCs with a platoon of M1 tanks attached to each GCV company.