I just watched the game v Parra again specifically to watch Bula. I think your assessment of his lack of involvement in attack is a little off the mark. Bula can be seen on most sets hanging around the middle and postioning himself to support and he did plenty of work with ball in hand. He does not inject himself into the game so on that point you are correct, but his support play is very good. There is certainly room for improvement; so he has not reached his ceiling.
He has been overshadowed by the halves and the forwards to date - but his support play will see him come to the fore at times throughout the year. If you look back at Edwards, who you hold up as an example of what Bula is not, in his early days he struggled under the high ball and the pace of the game - to the point he was hooked at least once. Look at the player he has developed into.
