I don't know how big his space is, but most sati-dom strains like cheese stretch to 300% their starting size when you flip to 12/12. That thing is already huge, he could EASILY run into space management problems, or even worse bugs or mold with a plant that big and bushy. If you start with 8-10 small clones and flip them to 12/12 as soon as they're rooted, you'll get 8-12 medium sized single cola plants that could yield up to an ounce or so a piece. That thing, flipped to 12/12, would turn into a monster and probably create more problems than it's worth.
I guess to answer your question, yeah, you could just flip her, but I think there are other options that make more sense.