Lunatik Pandora
Newbie
I was a little confused about Omega as well as Nero in Dirge of Cerberus. When we see it at some point, there are shadow tentacles. Was this due to the merge between Nero and Weiss? Also, what was the deal with Nero's power? Was he actually able to open a portal to another dimension (seemingly a dark, empty one) as well as travel and bring captives to other dimensions as seen with the battle with him in that area with the rocks, lava and chains? And I guess my final question would be does Omega have that power after the merger?
and after all the mako experiments etc they probably should have control over their powers aside from the fact that Hojo manipulated Weiss over his worldwide networking stuff..kinda forgot the story..well he perished when they merged anyway! So most likely when they merge they joined in terms of lifestream probably
I personally like to see it that since Omega was created by the planet so therefore he is created in the form of lifestream so I wouldn't be concern much about Omega having some shadowy skills when Nero and Weiss merge since they are "One" when they merge in the form of lifestream too, just that when Vincent entered Omega to stop Omega, Weiss was the original vessel since he was the only compatible vessel to join as one with Omega to begin with. So Weiss appeared best as the final boss as Omega Weiss 
Bad luck and timing I guess. 