I hadn't seen those posts, but have talked with Califa in the past. Petebojo hasn't logged in for more than a year, but I asked Califa if she had received any information from him. Anna's descendents have b/d info on her but I haven't seen any hard documentation like baptism/birth records or death certificates.
They haven't posted/shared any hard information on John (Johan) Pickner Sr., I am aware of-- it appears to be most anecdotal. I haven't had any luck finding any record of his death in Illinois (or immigration/naturalization/birth etc.).