a few issues at hand here arseegee, i can realte to wanting to ground the s#@! outta everything, i think it's simply inherent in us......
IMHO,it would seem that providing g-rods to the structure would mimic a lightning rod installation, simply aiding the structure in bleeding off a lightning strike.
in terms of an incomming charge to the service itself, a closer grid is a better grid, lower ohmic value following suit....(250.4...et all..)
the reduction of GEC size for "sole electrodes" , to my understanding, means they are all run back to the MBJ individually, applicable to all except A-C in 250.66
Assumably Kirchhof's laws
apply here to latter charge....
as to the MBJ, ( and this is a tad of a highjack)
, i've ended up in 366.7
(1000a per square inch of cu, 700a for al)
wondering about the last sentron unit's intergrity , with tape measure in hand....