Feedback and Marking for a practice essay for An Inspector Calls (AQA)

Question: How does Priestley use the Inspector to suggest the need for social change in An Inspector Calls?
Throughout the allegory 'An Inspector Calls', Priestley suggests the need for social change by the Inspector's omniscient presentation and constant domination over the dialogue in the play. The Inspector's arrival marks a shift in authority from Mr Birling to the Inspector as Arthur has controlled the dialogue of the play, up to this point. Perhaps Priestley utilises the Inspector as an antithesis to Mr Birling as an attempt to criticise and illuminate the immoral and selfish acts of the bourgeois class.
In act 1, succeeding the arrival of the Inspector, Priestley contorts the power dynamics by presenting the Inspector as the authoritative figure. Despite the Inspector being of a lower social stratum, he juxtaposes Arthur's beliefs and reveals the hidden hypocrisy of capitalism. The Inspector believes that it is 'better to ask for the earth than to take it'. This metaphor deconstructs Arthur's ideology and ingeniously rephrases his very own words, manipulating the very meaning to shock Mr Birling with his own contradictory beliefs. The verb 'take' creates and aggressive tone which portrays the upper-class as criminals. This portrayal is evident to be ironic, as evidenced by Gerald's prior declaration that they are 'not criminals'. These constant refutations intentionally construct a mockery of the Birling family, consequently Priestley satarises the upper-class aswell.
The need for social change is also exemplified through the Inspector's seemingly omniscient character. Unlike Mr Birling's sanctimonious portrayal, the Inspector fails to be invalidated throughout the play. The Inspector's power is abstract, it is through his exceptional knowledge that he persuades the 'younger generation' to become proxies of himself. By the end of the play, the Inspector has completed the revolution of Sheila's character and she begins to mimic the Inspector's dialog and translates it into a sociolect her parents will understand, however she is constantly dismissed as hysterical. A value of socialism is dedication which perhaps depicts Sheila's reluctance to conform and restore status quo. Succeeding the departure of the Inspector, Sheila quotes the Inspector's final speech, out of respect and understanding of his moral message, by stating, 'fire and blood and anguish' exactly like the Inspector. This metaphor contains three abstract nouns - 'fire','blood','anguish' - creating a semantic field of hell. An extremely religious society, such as the Edwardians would have been stricken by this imagery, hence making amthe audience adhere more to her metaphor. Priestley intended this so the audience were more likely to take onboard the Inspector's moral message so that they could be changemakers in society.
'An Inspector Calls' is structured as a cyclical narrative due to the play beginning and ending with an Inspector calling the Birling residence indicating the prolonged consequences if capitalists, like Mr Birling and Gerald, keep dismissing any form of confrontation as a 'hoax'. These static characters must change for the gretaer good in order for there to be a noticeable change in society. Alternatively, the cyclical structure of the play could demonstrate the lack of explicit change the Inspector's presence had. Part of the socialist message is to work together so it is understandable why the presence of one figure cannot complete a revolution in society, however it is up to the 'members' of society to work together to create definite change.