My son and I pulled the head off his /6 last night in hopes of putting a new head on and rolling down the road. There is a jagged discoloration in #5 that looks like a crack. If you zoom in, there is also a scratch that I looks like it might be from a busted ring. Is a line like this potentially caused by a cracked ring? Link to updated pics showing the original "crack" is not, as well as an additional imperfection that also does not appear to be a crack based on the state of existing carbon in the chamber where there should be none had a crack been present. Any way this isn't a crack?