Cary and Alicia are equal partners at Florrick & Agos. Alicia doesn't have any upper hand. There's a proposal. One way is to agree to the proposal unilaterally. But, if there's dissent, voting among the board members is the second best. It's not like the votes were being bought like what was being done at Lockhart & Gardner.
Talking about the firm, the sheer existence of it was in jeopardy when Cary allowed himself to be conned by Kalinda. They had to operate from Alicia's home to start with.