RCM details in 2B will only reflect for those vendors who are registered. But there can be transactions where you received services from unregistered persons where RCM is required so you will have to pay rcm even when it doesn't reflect in 2B. You will fill liability and ITC both manually in such case
In addition to above, I would like to add , if he purchase from Unregistered supplier then he has to prepare SELF INVOICE as per section 39(3)(f) of the CGST Act within time limit , and file return, same will be reflected in GSTR2B. ( RCM as per section 9(3) of the CGST Act)
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