No but logically if he wasn't in charge of the signings as some folk like to shout out here then why not walk.
If you are not in charge then walk and say its me who has the final say or I just leave. But know he stays so I think he had the final say on most of them players.
Because end of the day you get judged by what players you bring in
He has a say without a doubt. But while there's a committee in place he can't take all the blame. I read somewhere on here that Mario was basically a take it or you get nothing situation after we had Remy all but signed! That's no way to work.
As for him walking? Why would he? LFC is still a massive job in football and imagine if he succeeds at it. It's a great opportunity for him regardless of the set up.