How could or should the 6.5 mm Grendel be improved?

[stanc]

Exactly! To make the assumption that the Grendel is an inadequate LMG round is misguided to say the least.

It is not an assumption. It's a conclusion based on analysis of available info. From the OP:

Against this backdrop the armies of several NATO members are looking at alternate calibers. Not surprisingly the 6.5 mm Grendel is starting to receive a lot of attention. it is certainly a highly respected solution and is now being evaluated widely. With all due respect to forum members own testing, a consensus opinion about the Grendel appears to be forming from within the military community. Let me underline the issues:

•The Grendel doesn't quite match 7.62 mm at 1,000 metres across all combat scenarios