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As long as when you implement with phase I (INV,OM ,PO), here all the Orgs are termed as INV Orgs thru which you can transact for OM, PO and INV. For any Inv Org all the distribution modules are transcated.
Now if you go with phase II (OPM & EAM), here Inv Orgs necessarly required to become OPM Org which need to be "Process Enabled" then all these OPM Org can go for OPM related transactions.
Hence the proposed Phases are well recommoned, or even you can go with Simaltaneous implementations too.