They use their tongues to mosh the food against the roof of their mouths, so long as its soft enough to fall apart they should be fine. You could try it on yourself first, if its easy to mosh it in your mouth without using your teeth, its fine for LO.
My LO gags when something is too big for her to swallow and it very good at bringing it to the front of her mouth and spitting it out if she doesnt want it. Few scary moments but you can judge at the time if its true choking or just gagging on it and trying to reject it from the back of their mouths. Their gums are also very tough at chewing foods, i gave some penne pasta yesterday with melted cheese mixed with cottage cheese and she was fine with it. She held the penne in her hand and used her 2 bottom teeth to bite bits off. Yes i was watching her like a hawk and wondering if i'd done the right thing giving it but it all went really well.
When you put things down on the tray infront of them for BLW, most of it gets squished in their hands and thrown on the floor anyway though!