If I was looking to give him the benefit of the doubt, I'd say that the long absences through injury (didn't he have a cracked disc in his back at one point?) are a reasonable excuse for being a bit behind where he should be. Usually, though, I'd definitely agree that a 24-year-old is well overdue to be starting week in, week out, and as much as Chelsea seem to have kept faith with him, they're unlikely to make him a guaranteed starter ahead of players that have been brought in for serious money.
I'd be a bit less enthusiastic about Hudson-Odoi, as I've always felt he was christened a rising star before he'd really done anything at senior level. At the same time, it's tricky to judge Chelsea players because they don't really operate like any other club, and so my opinion opinion - I think that if an academy graduate is going to make it at a truly top side, they'll find themselves playing regularly as teenagers - sort of goes out the window.