An interesting development! True, Okita isn't really in the "let's trust people to play nice" camp, so a preemptive strike is very much up her alley. That said, despite what that last panel might be implying, she shouldn't normally be able to take on Ryouma and Oryou together in a straight fight. Next chapter should be interesting (or a blue balls as either someone breaks up the fight or the chapter viewpoint focuses somewhere else).
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Ryouma doesn't seem to have earned that much fame in the GudaGuda verse, probably as a result of his propensity to "shadily" work behind the scenes. Hijikata doesn't recognise him either, in either Guda 3 or 4.