Ive just noticed a couple of things whilest watching episode 194 (end of skypiea)
1 - The Rio Ponyglyph isnt actually a poneglyph at all, it is Gol D Rogers documentation of all the poneglyphs that he has taken with him to Raftel.
2 - Elements can be cut (the age old 'can mihawk cut logia elements debate'), in episode 193 zoro is training and mentions that any element can be cut. (it's only a short part, but i never hear people mention this when having a discussion about cutting elements)
Im probably just pointing out the obvious here but i thought id post them anyway since it's new to me :D