Definitely start solids, especially finger foods. Feeding himself will start encouraging independence. But my son had the same issue and during bottle time i would have him on my lap facing forward and i would help him hold the bottle. So i would hold his grasp around the bottle took a while but he got the hang. But i also have never heard anything about not starting solids if child can’t hold bottle.
Reply to Mighty Max (10 mos) doesn’t hold his own bottle yet