The pro with having a committee can also be regarded a con; too many cooks spoil the broth (I had to google that proverb and I'm not even sure it's correct).
That's really archaic way of looking at it, tbh. Its not 1975, assessing player's ability properly is a job not one person can do. There's too much expertise and input from too many different fields, that all has to be taken into consideration. You need statistics and analysis people, medical people, business people, sports psychology people, and so on and so on.
Its either sticking to old ways and praying the one guy you hire will turn out to be Bill Gates of talent scouting, or just relying on a committee sort of thing. Its a no brainer which option is more sensible.
Ultimately I would say its less of a debate about whether committee is necessary, and more of a debate whether people on the committee are good enough at their jobs, and how exactly the committee should approach decision making. Because that's really the key thing here. If they can force signings on manager, that'd be borderline retarded. If they can force
type if signing on manager, that'd also be retarded.
The way I'd do this at least, is Rodgers identifies what type of player he wants, then analysis and scouting department comes up with a list, then bussiness people eliminate those that are unrealistic, then they have a majority vote on who to sign, with Rodgers always having the ability to veto the signings.