I think that the write up for the Ronnie Raymond version works fine. The limitation states that he suffers a -2CS to FEAT rolls when not able to communicate with someone who knows chemistry. Obviously that's a bit broad and should be limited specifically to certain power FEATs... and having Stein in his brain effectively allowed him to ignore the limitation most of the time. But it's a good limit to keep on hand in case something happens to limit his access to Stein's knowledge... for example somehow being fused with someone else, or if Stein was mentally incapacitated prior to merging... I vaguely recall an issue where the professor wasn't wearing his glasses when Ronnie merged and it affected his vision a little (
making everything a little blurry). That being the case, if he was on his own because the professor was comatose when they merged or perhaps suffering amnesia, the limitation could take full effect.
A high post count is indicative of little more than one having the time to post frequently.
It does not mean a person is more knowledgeable on any given topic than anyone else.