ESA assessment does DM go with what HCP says

Hello
This is my first entry to forum. My son has just has his first ESA (income related) assessment. I requested HCP medical report one week after assessment and received it the following day. The HCP medical report has indicated 18 month review and from her descriptors I have calculated 27 points awarded. Some of her entries state descriptor does not apply, but has given no explanation as to why he does not meet that descriptor? Should HCP have given an explanation?
My question is it likely that the dwp decision maker will not go with the HCP report and award him less points (less than 15, so would not qualify for esa). My sons GP provided evidence to support his claim. Such as stating that he need prompting to dress, wash etc. The HCP stated before assessment that he had good medical evidence.

Hello Gordon, Thank you kindly for your reply. Upon reading the HCP medical report again, none of the descriptors are equivalent to the 15 point score and HCP has indicated that in her opinion none of the exceptional circumstances apply. So it looks like support group will not be the outcome of his ESA assessment. My son has difficulty with social interaction with people he knows and people that he does not know. ESA activity 16 - the HCP choose descriptor: Engagement in social contact with someone unfamiliar to the claimant is always precluded due to difficulty relating to others or significant distress experienced by the individual (9 points)
However, HCP report goes on to say: "He reports that he can at times go out with his friends but that he has not been out with them in several weeks. He will always drink before he goes out as he feels very anxious and this helps with the anxiety."
What my son was trying to explain that he takes alcohol before meeting up with friends as he is anxious meeting them. He has just started University in September so everyone is unfamiliar to him and he has difficulty interacting and making friends. The GP report stated: "Difficulty mixing with other people, using alcohol to relax before going out with friends/peers. Can find social interaction overwhelming at times, which exacerbate his anxiety and mood. Tends to avoid social situations."
My question is: In view of GP report would he not meet the descriptor: Engagement in social contact is always precluded due to difficulty relating to others or significant distress experienced by the individual (15 points support group)?
Or am I missing something - should the GP report be more specific?
Your opinion would be much appreciated.

Thank you for you reply. My son has just received ESA decision letter. Please bear in mind that this is his first initial claim for ESA which he claimed in September and was in receipt of the assessment benefit amount. The medical assessment carried out by HCP took place the following January 2018. Decision letter sates "a decision on your capability for work. You have moved from the Support Group to the Work Related Activity Group". I don't understand this. This is the first decision letter he has received and he does not have any other letters that state he was in the Support Group. I have asked ESA to send out all reports that the decision maker used in order to arrive at their decision. Is it possible that the decision maker had decided to place him in the Support Group but then this was changed after the HCP report was received?
He has also been asked to attend an interview with a work coach. Which I understand is the process with the WRAG. Is it possible that he could have this interview deferred until March sometime (when i would be able to attend with him). He has problems interacting with people that he does not know and when under pressure/stressed he does not retain information and ends up agreeing to something just to get out of the situation. I am concerned that he would not be able to explain his situation properly and end up with with WRAG obligations that would not be suitable for his health situation and he would not be able to fulfill those obligations.
Your comments would be much appreciated.