Crawling? Not much

Little Andrew is 8+months now but his crawling skill is still very commando style. He doesn't lift himself up - hands or legs. He just crawls with his tummy and flaps his legs. And the head dive still happens, though he is getting better.

He loves to "walk" and I'm not doing the hold n walk thing. But I do let him try to stand holding onto the sofa edge or the bed. Everyone says he is gonna walk soon. And in my heart I thought, he can't even pull himself up- from his back to seated position. How is it possible he can walk soon?!?