curr_items_tot & vb_replica_curr_items mismatch when rebalancing new 1.8.1 and 2.0.1 nodes at once to 1.8.1 cluster that was rebooted before

http://qa.hq.northscale.net/job/centos-64-2.0-new-rebalance-mixed-cluster/25/consoleFull
./testrunner -i /tmp/rebalance_in.ini -t rebalance.rebalancein.RebalanceInTests.rebalance_in_with_warming_up,nodes_in=3,items=100000,replicas=2,get-logs=True,wait_timeout=180,get-cbcollect-info=True,skip_cleanup=True

steps:
1. cluster with 1 node 1.8.1-937-rel(10.3.3.92), default bucket( replica=2) with 100000 items
2. stop 10.3.3.92, sleep 20 secs, start node
3. add 2 1.8.1-937-rel nodes(10.3.3.91, 10.3.3.93) and 1 2.0.1-146-rel (10.3.3.99) and rebalance cluster

result:
Not Ready: curr_items_tot 299376 == 300000 expected on '10.3.3.92:8091''10.3.3.99:8091''10.3.3.93:8091''10.3.3.91:8091'
Not Ready: vb_replica_curr_items 199376 == 200000 expected on '10.3.3.92:8091''10.3.3.99:8091''10.3.3.93:8091''10.3.3.91:8091'

[root@caper-007 bin]# ./cbstats 10.3.3.91:11210 all | grep items
curr_items: 24999
curr_items_tot: 74997
curr_temp_items: 0
ep_access_scanner_num_items: 0
ep_chk_max_items: 5000
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 0
ep_total_del_items: 0
ep_total_new_items: 147039
ep_uncommitted_items: 0
ep_warmup_min_items_threshold: 100
vb_active_curr_items: 24999
vb_active_num_ref_items: 24999
vb_pending_curr_items: 0
vb_pending_num_ref_items: 0
vb_replica_curr_items: 49998
vb_replica_num_ref_items: 0
[root@caper-007 bin]# ./cbstats 10.3.3.92:11210 all | grep items
curr_items: 25001
curr_items_tot: 74874
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 2
ep_total_del_items: 0
ep_total_new_items: 48296
ep_uncommitted_items: 0
vb_active_curr_items: 25001
vb_pending_curr_items: 0
vb_replica_curr_items: 49873
[root@caper-007 bin]# ./cbstats 10.3.3.93:11210 all | grep items
curr_items: 25001
curr_items_tot: 74904
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 6
ep_total_del_items: 0
ep_total_new_items: 90619
ep_uncommitted_items: 0
vb_active_curr_items: 25001
vb_pending_curr_items: 0
vb_replica_curr_items: 49903
[root@caper-007 bin]# ./cbstats 10.3.3.99:11210 all | grep items
curr_items: 24999
curr_items_tot: 74601
curr_temp_items: 0
ep_access_scanner_num_items: 0
ep_chk_max_items: 5000
ep_diskqueue_items: 0
ep_items_rm_from_checkpoints: 0
ep_total_del_items: 100
ep_total_new_items: 145143
ep_uncommitted_items: 0
ep_warmup_min_items_threshold: 100
vb_active_curr_items: 24999
vb_active_num_ref_items: 24999
vb_pending_curr_items: 0
vb_pending_num_ref_items: 0
vb_replica_curr_items: 49602
vb_replica_num_ref_items: 0

so, sum of curr_items_tot = 74997+ 74874+ 74904+ 74601=299376 != 300000

Chiyoung, is the test valid to check for mismatch these stats?