Benitez was a dictator shall we get him back. Hodgson's not a dictator either. So you say that we need a dictator, therefore we should get rid of hodgson as he is not a dictator.
I think this is the key point though. Roy doesn't have the assertive personality one needs to take the dictator role (or at least not as far as I can see from the side lines). The primary reason Benitez and H&G were always at odds was precisely because he didn't have control, so they gave him control of transfers but then took his money away (sale of Alonso money mysteriously missing). Ergo the "mutual" nature of Rafa leaving the club; he knew he couldn't continue to work in the same fashion, and in order to sell the club LFC needed to appear more accommodating in terms of how money would be spent by the manager. A sugar-daddy owner coming in would not want to always fight with a control freak manager about money.
NESV have expressed an interest in building the club for the future, so they will (through Commolli) control purchases of older players (aka they won't sign old/average players just because they have some experience). Roy has stated that looking after the academy, the reserves, and the first team is too much for him (it wasn't too much for Rafa, or Fergie, or Wenger, or any other top manager) ergo Roy is either bad at his job or just lazy, the latter generally being equitable with "bad at his job". He will therefore need someone to hold his hand during the transfer window as well; I can't see how this is bad for LFC (could be bad for Roy, but I'm not concerned about him).
I therefore can't see how the role of Commolli and the role of Parry are any different, except that Commolli knows a whole lot more about what makes a footballer worth signing.