If A is the primary account then at 60:

b will have 0 to grant
c will have 30 to grant
d will have 30 to grant
e will have 30 to grant

level the next team to 30 and

e grants d 30
d grants c 30
c grants b 30

no one can grant e levels so hes stuck at 30.

Its something along that line. Now the new 60s have 15 levels to grant from when they leveled to 30.