Is 'The only thing I know about Gilbert is that I find him listed as co-author of Muskrat Ramble .' a fitting logical lead-up to 'I wasn't aware of Gilbert's co-authorship of Muskrat Ramble.'
The only thing I know about Gilbert is that I find him listed as co-author of Muskrat Ramble .###I wasn't aware of Gilbert's co-authorship of Muskrat Ramble.