I read it again and still don't see where it says they have been cleared to carry Marines or have carried troops with the roters in the upright position.
I don't think the Osprey can take off or land unless its rotors are in the (mostly) upright position.
Just because this story on transcon flights doesn't specifically deal with the transporting of grunts doesn't mean it hasn't/isn't being done. Get a copy of the OT-IIG test report written a year ago or talk to the crews at VMMT-204, VMM-263 and VMX-22 and they'll clue you in.