@access-timeco A scenario I could imagine would be:
Big Mom is getting impatient with Pudding -> tells a Sweet General to seek the Man with the Burn Scar (if he's supposed to be someone who can read Poneglyphs, that's also how Kid could have learned about him), alternatively it could be the Sweet General heading for Three Eyed Tribe Island or wherever they are -> Kid intercepts him/her, steals the rubbing of the Poneglyph.
Still somewhat careless of course, but at this point I'm not considering it plot conveniance if the BM pirates are incompetent, it's just who they are.
Whatever scenario of Kidd getting the poneglyph from a Sweet commander, is just too convenient and stupid. It’s just Oda going the easiest way to make Kidd relevant. Apparently he just said, I don’t have time to think too much crap.
I have seen some people say that Big Mom pirates are a joke and this Kidd story just adds to it but the truth is that if you look at all the yonkos and their organization, Big Mom’s should be or should have been the best by far. Her main crew is constituted by her kids, many of whom are veterans in their 40s and with powerful fruits. She also had complete control of her territory unlike Kaido. Has she committed stupid mistakes, well other than hiring Bege, I can’t think of any. Luffy and a couple of strawhats besting her at WCI should not be seen as incompetence. Luffy’s the MC and he was gonna do that to anybody and he really had to struggle even with all the luck/help he could muster.