Multiple stanzas configured for the same device in multipath.conf - which takes precedence?

Solution In Progress - Updated -

Issue

Multiple stanzas configured for the same device in multipath.conf - which takes precedence?
What is the correct multipath notation for IBM SVC Storage? ^2145 or 2145? Which one should be used?

Environment

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
IBM SVC SAN Storage
dm-multipath

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