Can you name one performance where you've thought "geez why isn't Kennedy still out there?" The only time I've noticed his absence was against Melbourne and that was because he didn't make it onto the field until the game was well and truly lost. It just made me think it was such a waste to have a 'developed' front rower when Bullemor could have received that time.
Granted, I can see the steady observation. He usually does come on and produce a couple of solid carries. However if you pay close attention, he drifts out of the contest rather quickly and his defence is very sloppy. He doesn't necessarily miss tackles, but he loses them and usually finds himself out of position for the next play.
He tries hard which is what I think people notice, but he isn't what the Broncos need. They've put them under all sorts with their bench because they haven't gone that mix right. They need that middle forward who can play long minutes, they need a mobile one that can play middle or edge comfortably and they need that edge backrow who can play backs if need be. Ideally you'd have a dummy half that can play 80 in this day and age, but with Turpin's run of injuries it's in their best interest to carry a dummy half.
The way it is, they've got three players who can barely get through 20 minutes.