the entity using the satoshi pseudonym is one person. that is established.
however satoshis idea's are a patchwork of many older concepts that alone would not work but satoshi was the brainchild of patching it all together into something that works. plus adding his own customisations and extra tweaks to it. which made it special and unique
also satoshi, worked with other people. that is established. but only the single entity used the satoshi pseudonym. all the rest helping out used their own pseudonyms.
base on what iread on internet satoshi we may not know who he or she was, we know what he did. Satoshi Nakamoto was the inventor of the bitcoin protocol, satoshi worked with people on the open source team, but took care never to reveal anything personal about himself and the last anyone heard from him was in the spring of 2011 when he said that he had moved on to other things".