Greene - Not sure about lightening, but I think you're right that something was going on prior to the construction work. I don't think the bark would be that bad that fast. I also noticed what looked like a rust spot but wonder what it looks like close up. Could there be insects? And maybe some sap oozing out running down the side? (I'm looking at the last picture.)
Whatever. But I do think you're on to something Greene.
