So is it just proton absorption?
I know neutron absorption is something that easily happens due to neutron having a neutra charge, a bit harder to do with a proton, but not impossible...
It could be. When Steven Krivit was interviewing Rossi, he asked about some particular detail which would have meant that the Widom-Larson theory was on the right track. Rossi let it slip that it was more like proton capture going on. From that point on, Krivit was very antagonistic towards Rossi. It’s even on video somewhere.
In terms of theory, I’ll just wait & see, but I doubt Widom/Larson have it right. My bet would be on Y.E.Kim’s Bose-Einstein Condensate theory or K.P.Sinha’s theory.