Where does it say it? Look at the language.
First, the CMI 121 certificate will be combined with the CO certificate.
Second, the UA 121 certificate will be combined with the CO certificate.
Then it says the CO 145 certificate will be combined with UA's 145 certificate.
Notice the order of these things? You aren't saying that UA will be merging with a new CMI are you?
Further down it explains the benefits of certain combinations. CO's 121 certificate has some technology advantages already in existence plus "close conformity to current FAA standard language." UA's 145 certificate "enables increased maintenance capabilities, enhanced repair station authorizations and more maintenance volume when compared with CO’s 145 certificate."
The language is pretty clear is to which certificates they are going to use. When I talked with an MEC member a few weeks ago, that individual said the company was close to making its decision on which certificates would be used. It was looking, at the time, exactly what was stated above due to authorizations and technology already in place on one certificate over the other. It would be about time and money.