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Initial group and assignment: W1([AC0, AT1]), W2([AT2, BC0]), W3([BT1])
Config topic contains: AC0, AT1, AT2, BC0, BT1
W2 leaves
Rebalance is triggered 
W1 joins with assignment: [AC0, AT1]
W3 joins with assignment: [BT1]
W1 becomes leader
W1 computes and sends assignments:
W1(delay: d, assigned: [AC0, AT1], revoked: [])
W3(delay: d, assigned: [BT1], revoked: [])
Before delay d expires:
W2 joins with assignment: []
Rebalance is triggered
W1 becomes leader
W1 computes and sends assignments:
W1(delay: d', assigned: [AC0, AT1], revoked: [])
W2(delay: d', assigned: [], revoked: [])
W3(delay: d', assigned: [BT1], revoked: [])
d' is the remaining delay
W1, which is the leader, leaves
Rebalance is triggered 
W2 joins with assignment: []
W3 joins with assignment: [BT1]
W3 becomes leader. 
There's an active delay in progress.
W3 computes and sends assignments:
W2(delay: d'', assigned: [], revoked: [])
W3(delay: d'', assigned: [BT1, AT1], revoked: [])
d'' is the remaining delay
Before delay d'' expires:
W1 joins with assignment: []
Rebalance is triggered
W3 becomes leader
W3 computes and sends assignments:
W1(delay: d''', assigned: [], revoked: [])
W2(delay: d''', assigned: [], revoked: [])
W3(delay: d''', assigned: [BT1], revoked: [])
After delay d''':
W1 joins with assignment: []
W2 joins with assignment: []
W3 joins with assignment: [BT1]
Rebalance is triggered
W3 becomes leader
W3 computes and sends assignments:
W1(delay: 0, assigned: [BC0, AT2], revoked: [])
W2(delay: 0, assigned: [AC0, AT1], revoked: [])
W3(delay: 0, assigned: [BT1], revoked: [])