I'm not sure how much of a discussion is possible, but here are my thoughts. Yes, 6.5 Grendel would seem well suited to LE use.
Nearly all engagement distances for LE are very short range. With expanding bullets, lethality/incapacitation ought to be more than adequate.
The lesser recoil (compared to .308 Win) would enhance the ability of police marksmen to make precision shots, vital in hostage situations.
In contrast to military use, ammo load is not an issue, so 5.56 carbines and SBRs could also be Grendelized, thereby allowing one caliber to replace two (5.56 and 7.62).
Next question?
