Yeah I think that will be a concern... in origin Bhunt is basically the second hooker, so he's mostly filling time until Harry comes on, and then gets used again later in the game as a lock.
For us we'll want him to be the primary hooker... or at least the guy that spends the most time on the field out of the two.
If they go the origin route then it would be Bhunt starting and playing the first 30mins or so for Billy to come on.
Pending how Billy is going Bhunt can either come back on as a lock or back into hooker.
In that scenario Bhunt could come on to give Patty his 15mins or so break at the 50min mark whilst Billy stays on the field.
Patty comes back on for Billy... would need to see if that is using up more interchanges though
That would mean Bhunt is playing 60mins a game... which is a fair bit for a guy not used to playing hooker week in week out.
Bhunt's style of defence is more catch and wrap, and wait for support to finish off, which is like Cook/Mahoney. For Bhunt that results in a lot of missed tackles as he gets bumped off high up, but they're not necessarily completely ineffective missed tackles.
It's not the most effective style of defence though and he'll become a spot up guy in the middle of the field.
In origin I've seen Bhunt defend himself wider out of the middle 4... basically sits himself inside the 4 man... so for us that would be something like Bhunt, Riki/Piaks, Reyno/Ezra.... that can remove him from being a spot up guy in the middle and has him closer to his normal defence out on the edges