My main computer has an SSD with BIBM and multiple primary partitions. The Win10 Boot Item has only one slot filled. Win10. Upgrading to ver 1511 caused the Win10 partition to be resized 450 MiB smaller with the creation of a Recovery partition in the space. There was no partition overlap.
My test computer has an SSD with BIBM and multiple primary partitions. The Win10 Boot Item has only one slot filled. Win10. Upgrading to ver 1511 didn't cause the Win10 partition to be resized 450 MiB smaller. Winre.wim remained in the Recovery folder in the Win10 partition.
Confusing.