why wasnt it the other way round

I'm not quite sure if this has been queried or not, but I haven't stopped wondering as to why ZFX did not do a takeover/merger of oxr. But instead we had oxr putting in a takeover of the bigger compamy. After all ZFX has had a much bigger sp than OXR. And the other thing is Michael of zfx will be taking a bigger role in the new company than OH...............any ideas???????????????